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My 90 gs has 163xxx miles on it, I just got it saturday. Yesterday I noticed the idle revs up and down about 500 rpm sometimes, then it'll just sit at 1500 for a while. Then the revs drop back down to like 700 or so. It normaly revs about 700. What causes the idle to do that? Should I be worried about that?
take the fast idle air control valve out and clean it (IACV). I just had mine done yesterday..solved my erratic idle on the spot. Mine went from 1-3k .