I have a tcm with the k21 engine it will start and run a few seconds and then die the 5 amp fuse to the injector was bad so I replaced it as well as the injector. I could no hook up to it to read codes and the only code I got from the pedal was for the injector. I chose to replace the upper harness to be able to read with pc. Started unit and it does the same thing. Any ideas out there