I did a motor swap in my 2000 Chevy silveradio and the motor seems to backfiring at idle. I replaced and cleaned the MAF. What could be causing the little backfires? does the computer have to reset?
No something is slightly out of adjustment. Is there a check engine light on? One thing that causes this is the EGR Valve. And have the valves ben adjusted or touched? Also clean the throttle body.
Backfire sounds like an ignition timing problem,
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