3.7 488r mercruiser
I have a 3.7 488r I/O mercruiser. The last time I had the boat out I was just trying to see how fast it really was and had it full pin and was just trimming up the outdrive. Every time I would hit the up the motor would stumble and recover right away. My RMP was about 4600. Later on that day I was cruising and had been for about 2 hours. I was at 10 mph and throttled up to plane and when I did the motor stumbled, recovered and when up on plane. Just before I was going to bring the boat back to dock I hit a huge wave and the motor stalled and I have been unable to start it.
I was going to check for water in the gas, spark plugs and coil wire. I am thinking coil due to the trim problem. I have charged the battery and will try fixing tomorrow, any suggestions will be appreciated.
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