I have a mtd 26" snowblower with a 8 1/2 horse b&s. well last night i ran out of gas and i went to the local gas station got some gas and off i went fired up the snowblower at the next location working fine for about 10 min and then it died. I get it restarted and its running ruff, warms up running fine. as so as i put a load on it either engage the auger or the transmission it stalls. I get it started and runs ruff lower the choke runs on half speed so to speak, goes about 5 ft and dies. I am thinking i have bad gas or water in the gas ? what to you guys think??