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hey -- worked on outboards for many years-- mostly Johnson-Evinr-----most of time this can mean many things-- water in gas- jets in carb. need cleaning- most likely-- gas tank not vented or bad fuel line from tank to motor---- and also water in lower unit-hope this helps---

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Q: Why is your 1989 90 horse mercury outboard losing power and surges while only in gear and moving on the water you changed the plugs and you have the same problem Can it be the fuel or can it be moistu?
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