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    1999 4.3 merc WOT misfire

    Need a little help troubleshooting. I have a 99 mercruiser 4.3 that I purchased 3 months ago. It seems to be misfiring when at wide open throttle. It make a very audible pop pop pop noise only at WOT. Sounds kind of like a rev limiter in a car. When I back off the throttle it clears right up. I...
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