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1990 Chevrolet Cavalier Question: why does my car die during idle?

 

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movo, 3.1L V6, Arnold, MO, February 19, 2011, 10:51
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car dies during idle, have changed spark plugs, iac valve, icm, fuel injectors, clean fuel filter, new vacuum hoses. car will run as long as i give it gas but dies at idle speed, and sometimes backfires through cylinders. sometimes blows blue smoke through tailpipe.

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