I have a used 2011 New Holland TD80D with 870 hours on it. I was pulling a small planter when it lost power and died. I bled air out of the fuel line and operated the manual pump and it restarted, but died about 10 minutes later and would not restart. I changed both fuel filters, added biocide, fuel stabilizer, and fuel system cleaner, and started it with starting ether. It ran fine for about 30 minutes, then lost power and died while spraying herbicide. I can start it with ether and set the accelerator to idle at 1500 rpm and it will idle rough for about 15 seconds at 1200 rpm then rev back up for about 6 seconds, then back to rough and back to smooth consistently. In the field it will run until it gets warmed up, then dies under any load. It has a Tier II engine with mechanical injectors.