Hello bvkdw...are you talking about a backfire...literally... as in out the intake or an afterfire, from the exhaust? Backfires are rare so i will assume you ment afterfire. Scan for trouble codes, afterfires are from incorrect air/fuel mixtures, the ECM is likely receiving false information, the air intake sensor would cause this. Check for vacuum leaks and the 02 sensor.
Good luck...i hope this will fixya up
Timing belt jumped cog or two. replace belt.
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