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yeah, id clean it again, and also clean the area where the manifold where the IAC mounts. then if its still not exactly as it should be, then replace it.
you can however check the IAC with an ohm meter. measure the resistance across terminals A & B and C & D ( top two and bottom two terminals). the resistance should be 40-80 ohms, if not, replace it.
if it checks ok, then you know a more thorough cleaning is needed.
also be sure when you re-install the IAC that the distance from the IAC mounting flange to the tip of the pintle is less than 1-1/8". if its greater than that, press the pintle in, till its less than 1-1/8"
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