I have a 200 Mariner 200 Magnum started running rough like not running on all cylinders. Plows through the water getting on plane, no bottom end, when it finally breakers over, you can feel the power come up and send a bit better but still not right. At the same time this happened I have noticed the water pressure is not at the normal 7-12 but 15-20. I have changed plugs and fuel filter with no real change....
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