Thats the same symptoms I had was trying to get up on plane and the motor shuttered no noticable RPM jump back off and it was fine, try again same thing, did manage to get up on plane and it would shutter every 3-4 seconds, it also went in and out of gear just fine no noises anything. When this happened I was out around Race point so I decided it was such a nice day we would chug back home at 2500 rpm most I could get without the shutter. After burning off some fuel and getting away from the area where the current was ripping against us I started to tap the throttle gently a little at a time and was able to get the boat up on plane and I left everything just the way it was and we cruised all the way back to the ramp. I have had hubs go south before and it was a night and day difference from what I experienced with the gearcase going south. Besides if it is a gearcase he can call his insurance company and tell him he hit something and they will pay for most of it.
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