New piston rings and bearings was
replaced,cilinder head was done,car starts but it
backfires and dont want to ref up. Plugs and
coils was replaced,timing was set to its
mark,problem still exist. Plse help
Sounds like it might be a re-assembly problem causing the cylinders to fire out of order. Try shifting the timing to see if it changes - this is not a fix, just a way to help you determine what is wrong.
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