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dirty IACV is most likely
run some throttle body cleaner through the car
or, pull the iacv off and give it a good thorough cleaning
if you want to be super thorough, buy new intake gaskets, pull off the whole intake manifold and clean the whole thing out with a ton of cleaner/degreaser. pull the IACV off the back and clean that out as well. reinstall. you'd be amazed at the difference in feeling. alot of gunk gets in there over the course of 10+ years.
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