I've got a 1998 Yamaha 200 hp 2 stroke. Runs like a banshee on muffs but in lake it will idle around good but sounds like it kills cylinders under load only runs good to about 2800 rpm. Won't plane out. It is currently in the shop and they have replaced CDI pulser coil and crank sensor.still same issues. Cleaned carbs new filters plugs and fuel lines. Same issues. Any ideas? Thanks