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Stumbling/bucking during revs/acceleration.

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Old 09-26-2011, 09:09 PM   #1
hardcore302
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Default Update! Stumbling/bucking during revs/acceleration.

Update: One of the plugs was broken and it was arcing to the coil.
All the plugs cane out smooth, surprisingly, replaced them and the coil. Good as new. End update.


Today I went for a drive and noticed a slightly erratic idle. I gave it some revs and noticed a stumble, almost like a stuttering.

While driving in all gears under mild to full acceleration, it stumbles bad to the point of bucking..

Could it be bad gas? It's not the tune as I had to return to stock for emissions reasons..
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Last edited by hardcore302; 05-02-2014 at 06:04 PM. Reason: update!
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Old 09-26-2011, 09:41 PM   #2
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It could be bad gas... Or when is the last time you have changed your fuel filter?
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Old 09-26-2011, 09:48 PM   #3
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Happened to me when I rain my CAI with the wrong tune.
Same symptoms.
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Old 09-26-2011, 10:13 PM   #4
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Quote:
Originally Posted by 2005Redfire6 View Post
It could be bad gas... Or when is the last time you have changed your fuel filter?
recently. i'm gonna clean the tb and maf tomorrow. hope it's not the plugs or cops...

anyone else? thanks!
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Old 09-26-2011, 10:17 PM   #5
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Might be a stupid suggestion...but are you still running the stock tune? Do you have an aftermarket CAI? Kind of goes with what kput said but could be as simple as that I suppose. Good luck with the cleaning and let us know how it goes.
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Old 09-26-2011, 10:50 PM   #6
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Might be a stupid suggestion...but are you still running the stock tune? Do you have an aftermarket CAI? Kind of goes with what kput said but could be as simple as that I suppose. Good luck with the cleaning and let us know how it goes.
I was about to mention that but figured he put the stock air box back on with the stock tune.... But then again maybe not? Lol!
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Old 09-26-2011, 10:50 PM   #7
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Quote:
Originally Posted by HxCGuitars View Post
Might be a stupid suggestion...but are you still running the stock tune? Do you have an aftermarket CAI? Kind of goes with what kput said but could be as simple as that I suppose. Good luck with the cleaning and let us know how it goes.
I put the stock intake and tune back. Threw in a cleaned and oiled drop in filter for the time being.
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Old 09-26-2011, 10:55 PM   #8
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Quote:
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I put the stock intake and tune back. Threw in a cleaned and oiled drop in filter for the time being.
I had figured, but always worth a check! Figured I'd ask!
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Old 09-26-2011, 11:14 PM   #9
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I have read that sometimes people put to much oil on their filters which in return ***** up the MAF readings. Try cleaning your TB and MAF tomorrow cause theres a good chance it might be that unless you honestly didnt overload on the air filter oil.

I remember a few days after I got my car I installed my hid headlights and forgot to plug the MAF back in and was getting the same symptoms as you. I **** myself thinking I messed up my new car somehow but a few minutes later I realized I never plugged it back in. Moral of the story -- Its the little things that you should check first
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Old 09-27-2011, 09:49 AM   #10
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Seems to have dissapeared the next morning. Last night I threw some 93 in a tank that had half a tank of 87 and drove it for a half hour. Maybe it was bad gas.

This morning I cleaned the TB and MAF. Seems to have dissapeared.
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Old 09-27-2011, 11:09 AM   #11
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Quote:
Originally Posted by hardcore302 View Post
Seems to have dissapeared the next morning. Last night I threw some 93 in a tank that had half a tank of 87 and drove it for a half hour. Maybe it was bad gas.

This morning I cleaned the TB and MAF. Seems to have dissapeared.
Cleaning the MAF is a great place to start when an oiled filter is in use.
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Old 09-27-2011, 04:43 PM   #12
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Quote:
Originally Posted by hardcore302 View Post
Seems to have dissapeared the next morning. Last night I threw some 93 in a tank that had half a tank of 87 and drove it for a half hour. Maybe it was bad gas.

This morning I cleaned the TB and MAF. Seems to have dissapeared.
Hi hardcore302,

I'm glad your idle hesitation was easily resolved! In the future, let me know if I can help in any way.

~Natasha
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Old 09-27-2011, 07:02 PM   #13
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Glad it's not the fuel pump TSB issue.
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Old 09-27-2011, 09:28 PM   #14
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ive had that happen to me once i think i had bad gas or something. next time i filled up it was all good, not sure your mileage but if your oil has ever been low your cams could have worn down (seen it happen before with similar symptoms) hopefully that not it though
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Old 09-27-2011, 11:55 PM   #15
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Thanks to everyone for the help!
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Old 08-30-2012, 11:05 AM   #16
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Digging up my old thread. This problem has been going on and off since the original post. I have been using a paper fiber with stock tune and air box. Maf and tb are clean. What else could it be? A bad cop ? Plugs? Its getting really annoying. Any help is appreciated .
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Old 08-30-2012, 02:16 PM   #17
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No codes? Just because the light isn't on doesn't mean it doesn't have any codes stored.

It could be a lot of things, such as a coil, fuel pump, a really clogged fuel filter, timing issue. These things are impossible to diagnose over the internet, much less so with no real information.
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Old 08-30-2012, 02:19 PM   #18
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does the fuel pump tsb apply to models 2007?
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Old 08-30-2012, 02:42 PM   #19
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Quote:
Originally Posted by hardcore302 View Post
does the fuel pump tsb apply to models 2007?
www.allfordmustangs.com/forums/attachments/2005-2010-mustang-gt-tech/22048d1166476255-s197-mustang-tsb-list-tsb06_9_9.pdf


Only to 05-06's, but you still haven't narrowed the focus down. Datalogging/monitoring will likely reveal the issue. Could still be air bubbles, weak pump, bad COP, plug, etc..
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Old 08-30-2012, 06:38 PM   #20
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ugh! thank you!
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Old 08-30-2012, 06:38 PM
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1994, 2008, 2010, 2011, 2nd, 50, 93, acceleration, aceleration, bucking, ford, gear, gt, mustang, stumble, stumbles, stumbling

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