RE: Fuel? Glow plugs?
My son is the same way.. he's 15 now and I can't keep him away from the toys... I have to sneak out without him so I can get some run time myself... Running a little rich in the winter is a good thing.. you have to run that way anyway due to the denser air... Give the motor some time, it will free up a bit and run better... a couple more tanks.. not a gallon or so... Keep us posted on your progress...