Hey guys looking for a little trouble shooting: When my car is at idle it will drop RPM's extremly low, then begin to knock (shakes the entire car) sometimes it will then just die and sometimes it will shoot back up to around 1500 RPMs and then repeat itself. I know this is very vague but if anyone has any ideas on what my problem could be I would really appreciate it. I do know for a fact that it is not my IAC because I just replaced it about 500 miles ago. My only thoughts were that it could have something to do with my clutch/flywheel/throw-out bearing.

 

Sounds like whenI put on my BBK cai,. the idle spot was filled with sand.

 

hey man that mustang looks awesome my car has the cobra front clip with the cobra wheels
what kinda wheels do you have???
they look sweet

 

I had the same problem. changed my IAC valve and the problem was fixed. May be your TB is dirty. Try cleaning it.

BTW, what kind of wheel are those? They look bad azz.
do you have a close up pic of the wheels?

Thanks,

 

I had the same problem. My PCM was bad.

 

Sorry but wahts a PCM?? and Articman i kinda have the same problem my car will drop a couple hunred RPMS at idle like down to 450 at the lowest and the car feels like its shaking. but it only does it once in a while... any suggestions?

 

IAC or TP sensor. be careful if you clean your tb... im not sure what year mustangs, but cleaning your tb can screw it up.

 

PCM = Powertrain Control Module

Basically the computer in your car.

 

Jesus!!!! how much did that cost

 

i heard you shouldnt clean your throttle body cause it has afilm on the inside designed to catch crap. i didnt know this and cleaned mine whenever i see that its dirty. A PCM not under warranty can run upwards of a thousand bucks, depending on the stealership