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why does my car die during idle? on 1990 Chevrolet Cavalier

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
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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