"We just got our 1998 sea ray, with 3.0L and alpha 1. We took it out on the water, boat starts and runs fine on muffs. It will rev 4500+ rpms. Put it in water, try to go, starts out like it is going to take off, gets to about 1700 rpms and that is it. Does not miss, does not sputter, just acts like that is all the power it has....have changed to smaller prop, cleaned carb, emptied fuel tank and put in new fuel...could it be accelerator pump or is it ign. prob. How do I check those?"