I have an '08 Mule, have not had any trouble with it at all until now. This problem does not happen all the time, but lately when I take a 2 mile drive to check on the cows, it will start spuddering, not taking gas, backfiring, etc. As long as it is driven around the house, short drive down in the pasture, it does fine. This has just started. I've changed the filters, gas filter, etc. Any other suggestions on what to look for. I've also changed where I'm buying my fuel, and put in gas additives. Let me hear from you. Another note, this machine is used for a lot of farm work. Not just recreation.