I'm having issue with my Kubota. It started in the summer when I was harrowing the pasture. It would run fine until it reached op temp than it would start stumbling and eventually would die. It would take several attempts to get it started and after it started it would take adequate minutes before it would normal again. It kept repeating this cycle until I decided to park it. I have changed all 3 fuel filters but I'm still having the same problem with the exception that since I changed the fuel filters it doesn't die but will continue to run rough and eventually clear up only to repeat the process. I would appreciate any help you folks can give me.