| If the terminals on the plug and connector are corroded then the solenoid for the IACV might not be getting power and will not be able to do it's job: compensate for extra load on the engine at idle by allowing more air in. If thats not it then I think you might have an air leak or your alternator is about to go.
*disclaimer*: all that I say may be true or I may be completely wrong and I accept that.... please, it is your duty as another person on the internet to tell me (in-politely) how wrong I am :) "The dreaded 2nd windshiled wiper swipe when you turn it off its almost like tis showing you that it's boss, and it doesn't have to stop when you tell it to :("-College Boy This is what happens when you leave your Z parked outside too long:
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