Hi richardchub. Welcome to the forum. This sounds typical of a vacuum leak. The Idle Air Control (IAC) you mentioned isn't a sensor. It is a motor that turns very slowly to different positions and moves a threaded rod to retract a valve to increase air flow around the throttle valve. It is controlled by the Engine Computer.
When the engine is still cold, use a spray bottle to spray water on the intake manifold gasket and vacuum hoses. You should see the water get sucked in and hear the engine slow down when you spray the leak. Also check the fresh air intake tubes for leaks. Any air that gets in without going through the MAF sensor will confuse the Engine Computer.
Caradiodoc
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Tuesday, April 13th, 2010 AT 10:25 PM