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Old 09-28-2020, 07:28 AM   #9
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Join Date: Aug 2011
Location: Eagle Bend, MN
Posts: 1,656
Default Re: Mystery missfire .

As its idling, lift the #4 spark plug strap enough to watch the spark. Make sure its steady and hot. If the cylinder fires with the strap lifted then you likely have a plug issue.
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