Have A problem. I own a 3.6L v6 AUTOMATIC mustang. and when i drive it i can let go of the gas pedal but my acceleration wont go down at all until i brake. need help! im sick of riding the brake. SICK OF THIS PROBLEM!!! HELP!

 

*3.8L*

 

Ok so what exactly is the problem here. Are the RPMs "hanging" staying up even after you let off the gas? Does the engine surge at all? Need more info, because I've owned quite a few Mustangs and I've never noticed a "problem". Mustangs do coast fairly well after you let off the gas, just the way they're designed, if this is what's happening it's normal.

 

my MPH stays up. for example if im on a open road and go 35 i'll let go of the gas and it will stay on 35MPH sometimes goes up 38-40MPH. and the only way my MPH lowers is if i press brake.

 

Forget the mph for a second. If you are sitting in park or neutral and you rev the engine. Does the rpms go back down? Also, what are the rpms at idle?

 

when i start my car my rpms go to 2000 then after a minute its goes down to 1000.. When i rev it, it goes down to 1000. and sometimes when im driving it'll high idles past 2000 but my MPH wont go up and then it has a little kick and my idle goes back to normal and mph does also. like if it slips. It only high idles when im stop at a red light

 

By your description I am thinking that your throttle linkage is sticking.

 

+1 your idle is a tad bit too high. You need to remove your air intake, a look at cleaning the throttle body and butterfly.

 

Don't mean to ask for more experiments, but if you get in the car and start it up cold it should high idle than gradually idle down below 1000. All this with car in park.

You mentioned that it only high idles when at a stop light. Have you tried shifting to neutral when this happens?

 

give the iac a good cleaning while you are in there checking stuff out