Hi, guys, a little puzzled about the way my tractor is misbehaving. Started it up, used the box blade for about 45 minutes to an hour. Climbed off to do something and a couple minutes later the engine died. Wouldn't start initially, then 10-15 minutes later started right up. Worked for another hour or so and the same thing happened again. Now I can't get it to start at all. Any advice or info would be greatly appreciated.