I have a Craftsman Snowblower 9 HP, 29" Thrower deck. I started it, and it ran for five minutes while I snowblowed the driveway. Then it stalled. Now, I can start it, but it only runs for a few seconds before stalling out again. It's full of gas and oil and has always run great. I'm wondering if there is a little water in the gas. Should I put dry gas into the tank? Do you have any other solutions? Thank you.

Replace the gasoline. Gasoline has a shelf life of 3-4 months. Never leave unused gas in a tank or the carburetor bowl of any small engine between seasons. In my area, BP stations still sell the original AMOCO premium. Using premium gasoline in small engines is not that expensive and keeps the cylinder head, piston and valves clean.