rough idling?

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.

what color is the stabil?


It is the marine formula. I think the bottle has a blue tint. The actual product color is…not sure.


What is the main difference between the red and the blue other than the word marine and price? Just wondering since you asked the question. Thanks

blue is for ethanol