i was riding out at bighorn, quad was running good, about 2-3 hours of riding, it stuttered like some one had turned off the gas, and died. 20 minutes later it fired up and ran great for about half a mile,stuttered and died. towed back to camp. checked spark plug ,air filter , fuel line, let sit for an hour and it fired up and ran great. then it happened again , P.O.'d loaded came home WT- is going on??? please help !!