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Old 10-10-2018, 09:45 PM   #2
Chuck Sea/Tac
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Join Date: May 2010
Location: Between Seattle & Tacoma
Posts: 2,351
Default Re: Terriable backfiring

Does it idle smoothly?
Is it hard to get it to idle?
I would look for a leaky intake gasket or cracked manifold
Try shorting each plug, one at a time and see if that changes the idle. That will narrow down a lean cylinder.
Do you have full flow gas feeding the carb?
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