I have a JD 2950 82 HP diesel. I needed to move a bit of snow out of the drive his AM and ran into a problem. I have a block heater and a magnetic oilpan heater on it. I got it to start OK and let it warm up a bit. Seemed the hydrallics were a bit slow but it is 5 degrees outside and I attributed it to that. I went to the end of the driveway and backed the tractor across the county road. Right in the middle of the raodway the tractor stopped dead. I couldn't get it started. Got the truck and put the jumper cables on it. The tractor started right up. I let it run while I disconnted the jumpers and moved the truck out of the way. I climbed back on the tractor and it died as soon as I let out the clutch. Seems the throttle has little effect on the RPM's. Could the fuel be gelled-I used some additive before it got cold. Bad injectors? I jumped it again, threw the cables off and drove it toward the barn. It died about halfway there. Runs normal for about 2 minutes and then just dies. Suggestions??? Thanks