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high idle upon start, then falls and hunts. AMM? 200 1991

I'm going to inspect today in daylight for vacuum leaks and check out the IAC as well. When this last round of issues started the check engine light came on and mechanic replaced the O2 sensor. It looks like he didn't even look for vacuum leaks as the hoses all look pretty untouched. I suspect AMM or IAC but need to be methodical on this I suppose.

thanks, Kirk S.






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