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could be iac not moving fast enough, and when you tapped it with a hammer it may have broke it free. i'd pull it off and see how dirty it is. that and clean the maf, and the throttle body. then again the iac is like 47 bucks at autozone so you could just change it. to check for a vacuum leak you could just hook a vacuum gauge onto it and it should read between 17 and 22"hg.
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