I had a 97 Z71 shortbread 5.7 Vortec that was a complete nightmare. I replaced the CSFI with the MPFI spider and shortly after that, actually within a week, I drove the truck about 100 feet and the engine stalled out and locked up. It ran like a monster after the upgrade so I couldn't understand what happened. Come to find out the injectors stuck open and flooded the engine hydrolocking it. It had ongoing 02 sensor problems and false misfire codes popping up so that must have had something to do with it. I'll stick to diesels.