ok so this 2001 had injectors replaced in the 60k mile range according to the vin check and also the pump around the same time. It now has 125000 miles so how can you tell if they are going out? I drove the truck and it ran fine...although i didnt get to really call on the engine cuz the owner rode with me. I love the truck but man I just dont wanna get a money pit. I looked for visual leaks around the heads and stuff but saw nothing. Engine was dusty so i know it had not been cleaned up to hide anything. Thanks for the help guys!