I have a F115 Yamaha and the engine starts great and runs like a champ, but when running for 20-30 minutes at high speed, I can slow to idle speed and the engine will not idle well. usually cuts off. Restart and it wants to cut back off unless I increase the throttle. It then will pause and jump until it starts to rapidly gain speed and then runs great at higher speeds.
anybody got any recommendations?
BTW-I always run Stabil engine treatment and only put non-ethanol gas in my boat.