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When the engine is first started there is no check engine light and seems to backfire the most when its cold. After warming up the check engine light comes on and stays on but only giving a lean O2 reading. As for the timing advancing more when reved up I do not know. If it does or doesnt what would that mean to me?
Do you think it can be the throttle body running lean due to some internal problem from injectors/idle air control causing the the O2 to read lean thus causing the computer to adjust the timing to correct to the point of backfiring?
Thanks Ken
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