Just bought a 1993 Excel with a Volvo Penta 230. Bought it dirt cheap as a "fixer upper," even though we don't really know what we're doing. It starts great and runs. First time out, we went around the whole lake at about 10 mph, then it finally kicked in and felt great. When we slowed her down, it wouldn't plane out or gain any speed for another 10 min or so. When we get fuel straight from a gas can, it runs great. Besides a tune up, what should we do next?<br />Thanks for helping very eager beginners!