recently when i start up the stang, (mainly when cold) the idle jumps way up to 2000rpms for like 30-45 secs, how can i fix this.. its a 5.0 with an h-pipe and k&n

 

clean out the iac, and make sure the tps is tuned

 

clean the mass sensor as it may have a lil oil residue from the filter

 

It does sound like the IAC. You can clean it with carb cleaner or you can replace it ($50.00 here).


Rye

 

I would clean both the IAC and the throttle body with some good carb or throttle body cleaner and see if this doesn't help you.

 

^Sounds like the right thing to do. Of course, there is a SMALL possibility that the computer (not just the TPS or IAC) is reading wrong...

 

not to be rude, but sounds like a normal car to me, all 3 of my mustangs do it, and so does the burb we have, when its cold out theres a sensor that tells the car to run rich, or something, and to bring the rpm's up also to heat up the engine quicker to operating temperature, im almost positive thats what it is, i beleive its sort of the same with carbed engines also, only they have something on the carb with a spring attatched that expands when it is colder, and contrracts once its hot, so that it is at the right temperature at idle when cold. so thats what i think

 

my dads truck and car idle up high too when its cold. i think its normal.