I have a 1979 Sunnerrunner with a Penta 200d which I believe is a 305, it is also has a Volvo 280 outdrive. It sat for about 1 1/2 year, i got it running with fresh gas, seafoam, and starter fluid. Would take a little starter fluid to get it going and then after that crank everytime, even after running it a bit yesterday (had trim tab problems) it cold started on first turn this morning. After pulling my mother in-law and son for approx 5 minutes my wife pulled me for about 10 and then it slowly lost power. I got in boat and confirmed the loss of power and we limped back to the dock with a max rev of about 2500 rpms. It revs fine in neutral but in drive it does not. This boat is new to me and I am new to boats. So not sure where to start. Thanks.