I had the 10HP Tecumseh MTD out this morning clearing heavy snow with a thick crust of ice on top from the freezing rain we got last night. It started fine and worked well but then after a bit it started sputtering and it stalled. It restarted but kept on sputtering at times. I opened the gas cap to check it there was enough gas and there was about a third of a tank. But I did notice the cap had the rubber liner out of place. It looks like what happened in this video by Donnyboy. Do I need a new gas cap? Mine is the red one at the one minute mark of the video...