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Asked by Barry Russ
MY 1992 VP Commodore V6 starts fine, but when it reaches operating temperature, the engine surges and revs rise and fall quickly in drive or neutral, though it doesn't stall. I have replaced air and fuel filters, spark plugs and leads, cleaned the throttle body and idle air control valve to no effect. What is the problem?
Answered by CarsGuide
8 Jun 2006I WOULD look at the oxygen sensor in the exhaust system or a temperature sensor. From what you describe I think your engine is running rich. Either the computer isn't getting the message that the engine is up to temperature and needs a normal mixture, or the oxygen sensor isn't working.
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