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Engine Idle surge after warm with no load

(1990 Chevrolet Corvette)
in Haslet, TX on May 20, 2011
The engine idle surges until I turn on the air conditioner.. No vacuum leaks found.. what could be the problem.. THought might be head gasket, checked the block for leaks and nothing... In need of help..
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Popular Answer
on May 20, 2011
Check you ignition wires ASAP, I have replaced wires on Vettes of this era for this very problem which is a hunting or surging idle, with out any load that goes away with the A/C on.

here are some shops:

https://repairpal.com/chevrolet-repair-in-haslet-texas
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