I have a 99 Maristar with the 330 hp motor. I just got back from a week in Tahoe (elevation 6200 ft) The boat would not idle well and would load up a bit, once I got it going above 1500 rpm or so, it ran fine. I changed the plugs, put a smaller prop on and still same problem. I got it home last night, started it in the driveway with the fake lake and it ran fine. Any suggestions of what it may be? I had a mobile mechanic come to our pier and look at it, he told me it may be the fuel pump, but since it ran fine at sea level, I am a little skeptic...
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