I have an L4060 LE. about a month ago I started having an issue where after a couple hours mowing the tractor would start to loose power, sometimes shutting down, but mostly loosing power for 30-40 seconds and then revving back-up. It will do this four or five times and then run fine for a couple minutes and then start doing it again. If I let it sit for 30 minutes or so it will run fine for 15 minutes and then start again. Once the issue starts it does not matter if I disengage the PTO, I still have the same problem.