thank you for the replys. there have been no check engine lights and the diagnostic tool i have is for a newer model. (plug is not the same)... i am in the process of finding a gauge set to test fuel pressure. i have read that optimum is 12-13 psi. what is the absolute lowest that the truck will operate at. also while watching the 2 injectors, the fuel does not spray out it trys to but more often than not it seems to dribble or run out. to me this says the pump pressure is bad... am i right in thinking this? thanks again