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the IACV is the usual suspect. if the idle shoots HIGHER than ~1200 then drops, then repeats ad nauseum, check the air bypass (idle adjustment) screw - tightining (restricting) that will often bring a surging idle under control when the IACV / FITV / temp sensor, coolant paths etc.. are verified to be good. leave it alone until those are verified, though.
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bad idle .
Thanks again to all who responded .
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