We have a new 05 Ski Supreme with a Mercruiser 350 ski mag. We have been careful through the break-in, and are up to 18 hours. On our last two outings we have experienced power loss in the engine. It runs fine under 3000 rpm. After a couple of minutes of running over 3000, the rpm's will drop off, come back up, drop off... The engine is running fine - not missing, not sputtering. Any thoughts would be greatly appreciated...
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