BumbleBeast

I bought my 1995 5 speed Mustang GT, about 4 months ago.

After Driving around for a while I noticed that it starts revingitself when I'm not moving. It'll normally rev the engine from 500rpm up to 1,000rpm sometimes it'll drop a little bit more below 500 and will jump up that much higher above 1,000. It gets very annoying at long stop lights and it's wasting a load of gas.

Anyone know what might cause this to happen? Any info would be much appreciated.

ColdCityMustang

At firs thought I would say a throttle posistioning sensor (TPS). Lol my ford truck would do that too, its embarassing and wait untill the car next to is a cop ....thats a bad day right there

sultan68

http://www.muscularmustangs.com/iac.php

give that a whirl
theres a few things there to try to fix an idle problem

94StinkinLincoln

that would be a surging idle, what mods do you have?
clean the maf and iac and that will help alot.

mjr46

run a koeo/koer test and check for codes..if none clean Iac , then maf, then look for vaccum leaks

etsxp

mine did the same thing when it was cold, i just cleaned the maf and i was good to go

BumbleBeast

Wow thanks for all the info everyone. I'll try all of those and hopefully that'll fix the problems.

I dont even know all the mods my car has yet, i know the stuff i've done, but not what the past owner has done, other than an upgraded clutch (which is insanely hard to press) and a cold air intake.

edit:: Here is a photo of the car when i first got it, since then i've replaced the old foggy headlights with some new ones. and added a few other things inside.

http://photos-c.ak.facebook.com/phot...64850_3997.jpg

aode08

On the 1995 , alot of times at the dealership, I have cleaned the MAF Element , Cold Air Intake Sensor on the Air inlet tube(air filter), and repalced the air filter if dirty.


Any IAC issues, it gets replaced if OEM, I have cleaned plenty, some come back, some dont, , others work by cleaning, some it helps, etc etc etc, so I just replace.