Ours did that too, sounds like pre detonation in our case, does it pop and surge? It will pull strong and then suddenly have a mare for a while, then come right. We haven't had the boat running (on the water, cranked it on the trailer a few times, don't want to go riding with no alternator) since the end of last season so we haven't had a chance to diagnose or fix it. The rotor cap was a bit corroded when we pulled that off, filled it with CRC and that seemed to help. Our alternator was toast too, so maybe it's not getting enough power. Is it a carbie or an EFI motor? One other thing we found was when the motor would shut off at idle we had a vacuum hose off the carb. Stuck it back on and she was mint. If that doesn't work maybe try bumping your idle up a bit. (Message edited by jtnz on August 10, 2008)
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