I would rebuild the carbs, probably some junk floating around in the bowls. You probably have some junk in your carbs from the old tank. That 115 is easy to work on and rebuilding carbs is a easy as pie. I had the issue with my Dad's Evinrude 120 and my Johnson 150. When you have junk in the carb the motor will run great until a piece of crud keeps the float needle from seating or a piece clogs your high speed jet then it will bogg down till it clears. Sometimes the debris will float around in there and the problem only occurs intermitently.
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