Boat starts runs great and then begins to miss

by Alice

I have a mercruiser boat will start up great every time, it will idle and it will take off and come out of the hole nicely, as well. After driving different distances sometimes a quarter of a mile and even up to 11 miles on the water it begins losing power and begins missing? What can this be? I have replaced fuel lines, fuel filter, drained gas and replaced with fresh. I have also double checked the points....I have had the carburetor rebuilt and gone thru 3 times in the last 3 months trying to solve the problem? Does anyone have any suggestions? Thank you,

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