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I have a 2000 SeaRay Sundeck with a 7.4 Mercruiser Bravo 3 drive. When I first bought the boat it would run 5000 plus rpms. I had to install a new gimbal ring. After that it will not turn more than 3800 rpms. I have replaced plugs, cap and rotor etc. and can not figure out what could be wrong. I...