engine sputters

by walt wiewiora
(toledo oh lucas)

I have a 1986 140 Mercruiser alpha one , after I run it for about 9 miles it starts to sputter slightly then slowly continues to get worse it continues to run though then miraculously goes away . This is the constant pattern im dealing with every time I take the boat out , what could it be ? (Its been tuned up and then some )

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