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    350 Magnum Marine Engine not holding RPMs

    "Good morning. I have twin "Good morning. I have twin 350 Mag engs in my 310 SeaRay with inboards. Port engine is rebuilt with 40 hours on it. Last week the port engine's rpms started to flutter (surges) and I have to add throttle above 3,000 and the syncronizer gauge would flutter with...
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