Boat starts runs great and then begins to miss

by Alice
(Texas)

I have a mercruiser 3.0..my 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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