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Mariner Engine Issue

Reel EarlyReel Early Posts: 44 Deckhand
I have a '93 90HP Mariner 3 cylinder. Under a load in the water the engine won't go past about 2500RPM with wide open throttle. In neutral in will go way past 2500 RPMs. Has anybody had this issue before. Where should I start trouble shooting. I'v already replaced the spark plugs, used carb cleaner, and have somewhat fresh fuel in the tank.

Any advice?

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