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Q: car has miss fire no engine light lit, what should i check on 2005 Saturn Ion

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i replaces spark plugs, air filter. put it on code tester, read no codes, but said mass air flow out of range, replaced mass air flow, but my car still dies when i am in gear in ideal, not when in park
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If you rev the engine up in park or neutral does it rev freely and smooth? also if you have it in park and turn the a/c on will it bog down and die? If it revs smoothly when in park and does not bog down when the ac is on it sounds like a problem with the torque converter not allowing the engine to spin freely of the transmission. If it does bog down and die when the ac is on and does not rev freely it could be an issue with the idle air control valve or a vacuum leak.
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