I have a 2010 Merc 115 on my 2010 model 2250 RCW The last two seasons it ran flawless. This year, last month it began hesitate when throttling up and would not exceed 2500 rpm. I would have to shut down and restart several times and reattempt full throttle before it would run normally. It also randomly had starting issues and some idling problems. All inconsistent. Fine one hour and not working the next. I do have clean fuel filters hi and low pressure, new gas, water separator so I am pretty sure it is not an issue with the gas. These motors do have a tell tale sign there is an issue with the complex fsm (fuel supply module) If you check your air filter on the air intake and it is falling apart (bits will get sucked into your engine). That degrading of the foam is from excessive gas fumes in the vent eating the filter. So I did have that issue. The intakes were cleaned. The dealer is now looking at the rest of the engine. I am convinced one , several or all of the fsm elements are defective. There several elements in that system. One I know is some type of fuel float that hangs up. Other elements that manage the fuel I think could also be bad. The dealer is doing some other checks first but I am watching my prime boating weeks disappear here and was hoping some one else may have found and fixed the problem. At the very least if you have a Merc 4 stroke go check your air filter and make sure it is not degrading and going into your engine. It will fall apart if really bad. Early stage damage will just show the filter to be very tacky or gooey and ready to break down