Here is how you clean your IAC i posted this before - but ya prob. didnt need the info then lol
no the IAC (Idle Air Control) valve or the or the IAB (Idle air bypass) -- what the IAC is an electrically-operated valve which allows air to bypass the throttle plate in a fuel injected engine to regulate engine idle speed. And if not working properly it will make your idle go frantic or should i say raise an lower with out compressing the throttle. In this age of fuel injection, idle problems can literally be caused by hundreds of different things. When your car is new the IAC works remarkably well. The problem arises when the car gets some miles on it (usually 75K+) and carbon fouling takes its toll.
What happens is dirt, excess air filter oil, and most notably carbon gunks up the IAC valve and doesn't allow it to either open or close properly. This can cause an really high idle, a lumpy/surging idle or no idle at all. The solution is to either replace or clean the IAC.
you should have no trouble finding yours. They all look basically the same
Removing the IAC:
This part is simple. The IAC has an electrical plug that needs to be disconnected (picture 2 "C") Then all you have to do is remove the two bolts (Picture 2 "A") that hold the IAC to the throttle body or intake. Watch out for the IAC motor to throttle body gasket, don't lose it!
Cleaning:
Next all you do is use the carb cleaner to clean the carbon out of both of the holes (picture 3 "C") in the IAC valve and both of the holes in the intake/throttle body.
Putting it back together:
A self explanatory step. Put the IAC in place and install/tighten the bolts. Make sure you don't forget to reinstall the gasket.
Fire her up!
Finally you need to start the car and let it run for a few minutes to burn any leftover carb cleaner in the intake. You may have to crank the engine a little more than normal to start it for the first time and don't worry about the white puff of smoke you see coming from the exhaust because again it's just the carb cleaner.
Good Luck!
diagram
On A Ecotec Engine
A better look @ it on the throttle body
What it looks like off
what it looks like with the valve an the motor seperated an cleaned
those are 2 posts i made - in the cavalier section
hope the help!