My folks have a pontoon boat with a 150 Yamaha. The last couple years the boat hasn't been used much. Was used several times 2 summers ago and I stored it with gas that had been treated with starbrite and ran through. Last year I backed it into the water just to crank it up and let it run for a few minutes and back into storage it went. Today we took it out and it fired right up but just seemed like it ran rough. I could feel vibration in the steering wheel and throughout the entire boat really. My first guess was bad gas but I'm far from an outboard mechanic. Any ideas? Thanks in advance, Andrew
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