When i push in my clutch the idle goes down until i stop then goes back up, and when i drive for a while then stop and turn off the truck for a about 20 min a go to start it then it dies and wont start for about 5 or so minuts and this problem is really pissing me off! does any 1 know what that could be??? i have brought it two 5 mechanics and they dont have a clue!

Could be TPS sensor (RPM)

run fault codes to check for accelerator position sensor problems . Check for vacuum leaks. If cable accelerator then check that the return spring on the end of the cable is attached and not missing.

Remove and clean the IAC valve with MAF cleaner...go for 10 minute drive, then see if rough idle condition is resolved...cheers

Could be the IAC(Idle air control valve). It could also be related to the IAT(Intake Air Temperature) sensor. The IAC should be in the throttle body and the IAT in the intake manifold.

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try to reset the computer if that doesnt work reset the idle speed it may have picked up bad codes

Sounds like a bad idle air motor (That controls idle) But you must pull compiter codes first (The computr tells it what to do)

Question? is the engine's heat normal, if not there's sensor that boosts idle when the engine is cold

If you removed the thrmostat, put it back in.FIRST

The ecm will tell the iac to idle up when it senses the ac is turned on.If the ac compressor doesn`t come on,there is no resistance on the motor,but the motor does not know that,so it idles up.Find out why the ac is doing this,it wouldn`t be low on freon,it would have to be,most likely the ac clutc going bad.Try this,turn ac on and when ac clutch goes off,be ready,and don`t get hurt,tap it lightly with a tool or something,but be carefull!.If it clicks back on,try it again when it stops,to make sure.This will tell you the ac clutch/coil assembley is bad.

does it return to idle when at 900, this is programmed to shut off fuel injectors when car is pushing engine to save you fuel for when going down a hill, u push clutch and a signal tells it u have which returns back to idle.

The most likely cause of this is the idle control valve. This can be cleaned with injector fluid or similar (for little cost), but may have to be replaced. Either way it is not too expensive, and can be fixed in less than 1 hour.

There is a recall for valve problems. The warranty for this problem has been extended to 100,000 miles for that. Check with your dealer to see if that is the problem. If no help contact GM.