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Old 10-19-2020, 08:34 AM   #7
old31
Senior Member
 
Join Date: Jan 2016
Posts: 2,103
Default Re: New engine - intermittent backfiring - stuck valve?

Open up the GAV as you are driving and see if that stops the problem.

It could be starving for fuel, add MMO and do as the others have said.
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