[Justin71105]

Looks like the engine isn't quite what I was told going off the injectors and pcm.

Doing a little research all the injectors are 25326903 which comes back for a 5.3L L59 Vin Z, flex fuel and the pcm is: 12576106 for 2003 Vortec Truck.

Now time to find a stand alone harness that will work with it.