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Engine loads up with carbon while trolling

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I have a merc cruiser 165 3.7 I/O

Thing runs like champ. Goes fast goes slow.  Problem is, when I slow to troll speed 1.5-2.0

My engine loads up with carbon. When I rev the engine up, it blows black junk on the water. It will do that for a few minutes and then clear itself.

Are my plugs too cold?

Or is this a carb issue ?




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