I loaned my tractor to a friend for two weeks (rule number one, never loan equipment). Anyhow, I picked the tractor up and took it to the next job where I encountered a problem with it idling down, almost choking out... I have fuel, and the engine was running just a few minutes before. The solenoid pops in and out and the glow plug indicator functions like always. Please offer any suggestions as I need to put my tractor on a trailer and get it undercover.