I recently purchased a boat with the above engine (1977). It has been sitting for a few years. It starts fine, but cuts out. Will a carb re-build do the trick? I have ordered two carb kits to do the rebuild. I took the carb off, cleaned the gunk out of the bowl on the bottom carb, put it back together, and it ran fine for a few minutes. An hour later, it started cutting out again, especially when I go from full gas to idle. Anything else?<br />Also, when I touch the screwdriver to some metal, and then to another piece of metal, I get a spark. I also saw a spark when I put the throttle down...I guess the metal (in the engine linkage)hit another piece of metal.... Is this normal? Will this cause the engine to cut out? How do you fix this problem. I need help!!! Thanks