This weekend we got hammered with snow and I took the mule out for fun. In the morning it ran okay, but when I stopped for lunch and came out later the thing barely ran and I had no power in the transmission. What I have done is drain the fuel tank, refueled, put heat in it, and gas treatment. I also changed the spark plug. The engine seems to be running better with the choke fully engaged and the accelerator fully presserd down. When I either let upi on the Accelerator or adjust the choke instant kill. Also, when I attempt to put it in gear, the machine will travel but very sluggishly. Also, I keep it in an unheated shed and when i stopped for lunch I left it outside for a few hours. Could ice have built up in the lines? Temp was around the freezing mark. Any thoughts or suggestions would be greatly helpful. Thanks in advance.