Could be many different things. Does it start easily after the initial start and run? If the carbs have never been serviced, probably would be a good idea to at least replace gaskets and check floats and needles. Could very well be an ethanol related problem. My old '85 merc 50 did not do well after the introduction of ethanol. Messed with the floats. Have always run non-ethanol since then even if I have to drive way out of the way to find it. I'm sure TK will chime in with better info, he knows outboards.
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