What Causes Backfiring on Acceleration?

Answer

If an engine is working at its best, it should not backfire. The things that causes backfiring on acceleration include unburnt air or fuel that ignites as it passes through the exhaust or igniting while it is still inside the intake manifold. In this case you should check the operation of the inlet valve in case it might have a leak.
Reference:
Q&A Related to "What Causes Backfiring on Acceleration?"
Out of time, or vapor locking if overheated.
http://wiki.answers.com/Q/What_causes_a_1994_s10_p...
Improper timing can result in both intake and exhaust backfires. A timing that is too advanced will detonate the spark plugs even before the intake valve gets a chance to fully close
http://www.ehow.com/info_8039252_causes-cars-backf...
timing may need to be adjusted or just a tune up.
http://answers.yahoo.com/question/index?qid=200711...
A small leak in the air injection system that feeds the exhaust system, a sudden
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