Hey everyone! I finally fixed my Kubota diesel tractor. At first, she wasn't giving me any power but she idle's well. She purred even better after changing the air filter, oil filter, and fuel filter. However, she won't increase her rpm higher than 1K and she won't stay running when I put her in gear. Since I'm not the original owner and since she was running great for a few months, I was really stumped. Turns out it was just debris INSIDE THE DARN FUEL TANK!!! Not enough to clog the fuel line but enough to keep sufficient fuel flow!!! Thank you all for your encouragement.