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Old 12-16-2007, 11:40 PM   #4
gpgtp_22
3" Exhaust
 
Join Date: Jan 2006
Location: Wisconsin
Posts: 80
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Some misfires don't show up at idle and only occur under heavy loads. I would check plugs/wires first. You can load the engine and mist water on the wires with a spray bottle and listen for arching to check the condition of the wires.
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