The water pressure gauge showed good water pressure, but the water intakes were clogged by barnacles etc. The motor was running hard at about 4500 rpm, when it started getting real loud and vibrating terribly. It never stalled & we were able to limp back to the marina at 2500 rpms. Forward & reverse seam to work fine & it will idle. The motor was barely squirting water out when running. After clearing the debris away from the water intakes, the motor is now squirting water out properly when running, but the motor vibrates terribly above an idle, even in neutral. A friend suggested that a cylinder may not be firing, but it doesn't sound like there is a miss, just the heavy vibrations. The motor is a 1987 in-line 6 cylinder which has never given me any problems. Any suggestions?
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