I am by no means a mechanic, but I do have an opinion on running on gas that's been in your tank all winter. In the past I used to fill the tank full and add Stab-bil when storing my boat during the winter months. When spring came around I would crank up the boat and it would run like crap until I got through the old tank of gas. I read a post a few years ago about a home done study about condensation in the fuel tank during winter lay up. Long story short, the conclusion of the study was that the amount of condensation is very minimal and that running your boat on old gas may actually be worse. Since reading that post a few years ago I have been storing my boat during the winter with about a half tank and a 20 gallon treatment of Stab-bil. When taking my boat out again after winter lay up I fill the tank full, thus having 1/2 a tank of old gas and 1/2 a tank of new. The difference in performance was drastic. No longer was my boat sputtering on old gas. I've been doing it this way ever since and have had zero issues. This may or may not be the solution to your issue, but it may help for future lay ups.
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