Johnson 1999 engine drops to 3500 RPM for no reason

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Hello, I have a problem in that if I am cruising at around 4000-4500 RPM at times my engine drops down to 3500 RPMS by itself and the boat nearly stops. The prop is a little beat up and there is some vibration when it happens but I dont think it is a prop problem.Anywhere past 5000 RPMS and no problem. My motor has a S.L.O.W. warning system that, acording to manual, drops RPMs to 2500 when overheats. But if that were hapening wouldn't it alarm also? It was serviced before by the previous owner and the reciept says "sync and link repair".It was taken in due to hard start and poor indle. Thanks for any input.
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Topic - Johnson 1999 engine drops to 3500 RPM for no reason - dale 13:38:32 04/26/03 (0)

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