4.6L (1996-2004 Modular) Mustang Technical discussions on 1996-2004 4.6 Liter Modular Motors (2V and 4V) within.

HELP! Rough idle and acceleration?!

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Old 04-12-2007, 09:45 AM
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jimfash
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Default HELP! Rough idle and acceleration?!

So my car started idling rough a couple days ago. Today, it is bucking on acceleration and continues even when I get it up to speed. Any thoughts? Fuel pump? Plugs?
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Old 04-12-2007, 10:19 AM
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firstonraceday96
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Default RE: HELP! Rough idle and acceleration?!

try you fuel filter first...there like 10 bucks at advance and take about 15 mins to put in.
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Old 04-12-2007, 10:37 AM
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jimfash
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Default RE: HELP! Rough idle and acceleration?!

cool, I will check that out. I also have a 96 gt. Anyway I can diagnose before trying parts?
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Old 04-12-2007, 01:37 PM
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Default RE: HELP! Rough idle and acceleration?!

any other suggestions?
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Old 04-12-2007, 01:40 PM
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richinwa
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Default RE: HELP! Rough idle and acceleration?!

You need to check your fuel pressure first. Have you done anything to the engine or fuel system lately or has it been ahrd to start or had a long crank time?
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Old 04-12-2007, 01:54 PM
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jimfash
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Default RE: HELP! Rough idle and acceleration?!

haven't done anything to the engine or system. It actually alwats starts up perfectly.
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Old 04-12-2007, 02:07 PM
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Brute03
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Default RE: HELP! Rough idle and acceleration?!

how many milesdo you haveon the plugs and wires? also, have you washed the engine recently?
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Old 04-12-2007, 03:08 PM
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Jexey
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Default RE: HELP! Rough idle and acceleration?!

I just got over this problem. Here's what you're going to do, it's cheap just takes a little time and it'll knock out some important things.

First make sure all your ignition wires are pushed in all the way. Drive it around and ifstill bucks drive back into your garage and take apart your throttle body, IAC, and air intake.

Clean everything (including the filter, refresh it and reoil it if possible) - the IAC and throttle body. (Do NOT spray any cleaner into these, just wipe them down as well as possible and be very careful cleaning your MAF)

Drive around, if anything your car will run better but if the bucking / idling problem still exists go and get new spark plugs. Don't get anything fancy, 1 prong plugs are quite fine. No point in spending 6 bucks on dual or 4 prong spark plugs.

I highly recommend the fuel filter as well, I fixed mine by just doing the above but the fuel filter could be it just as much as what i just mentioned.
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Old 04-12-2007, 05:45 PM
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jimfash
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Default RE: HELP! Rough idle and acceleration?!

hey, thanks for the long post jexey. I am going to give that all a try when I get home from work. I appreciate it!
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