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Discussion Starter · #1 ·
I've had problems with low idle and had previously cleaned the throttle body and IAC. This time bought a refurbished IAC and now cannot get idle down. Adjusting the idle screws does nothing.

1. Startup fine idle surges to 3K rpm in park. Then drops to 2500 rpm and resurges to 3K back and forth.
2. Turn on AC and idle drops to 2200 rpm in park but idle stabilizes, no surging.
3. Put into gear and idle drops to 1K rpm and car is driveable with no surges.
4. Back into park go to #1 above

I'm thinking I may have a vacuum problem somewhere or the new IAC is no good, ideas?
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