Check your owners manual for the correct gas to use in your boat motors. We went hali fishing at 36-30 which is about 7 miles out in the straits. Then after we got out there the motor would barely run with sputtering & stalling. We thought we had bad gas. When we checked the manual it said do not use the methynol added gas. After we drained it & refilled up it ran fine. If you have water in your gas try an additive that helps called HEET.