Every Chevy truck I have had that was MPI/EFI had injector issues. I was told that GM actually will honor injector replacement on out of warranty trucks. I know they did it for me several years ago. Two of the trucks I had also had fuel pump issues. Mine were both replaced under warranty. GM told me that the problem is that there fuel systems are sensitive to poor fuel quality and that it must be the gas stations I was going to. Well, we always used different stations and had no way to know which ones were the "bad" ones. Anyway, I finally got fed up and bought a Dodge.