SOURCE: backfiring
The backfiring on deceleration is typically associated with a loose timing chain.
If you put a wrench on the harmonic balancer bolt, turn the balancer gently until you feel the chain tighten, then rotate the opposite way until it tightens, how far does is move.
If it goes more than an inch, it is getting sloppy. If it moves closer to 2 inches, it is worn out.
Try that first then let me know and we can go from there.
Good luck.
Regards,
SOURCE: what do you set the
350 chevy engines,running ,bac off untill clicking is heard then tighten until just silent,then one
half turn more
Have you had the code or codes read it could be anything from plugged injectors the code-s will let you know
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