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Thanks to blindsquirrel, after changing the harness plugs to the 4 wire flat plug, and putting the correct injectors for the 2001 GMC, the car runs good after warm up. Now I just need to start...

Good point, no it doesn't really translate. You have sent me down the right path, the harness I used had white connectors for the isolated sensors and it looks like the 2001 Sierra would have had the...

Thanks for the reply.
They are both new denso's white plug. Could it be the wiring or maybe where they are located in the stream?

This is my first post, first swap, first attempt at tuning. I have a 2001 5.3 LM7 with a 02 Z06 cam, 799 heads, L33 rotating assembly, stock truck intake and throttle body with 25317628 injectors,...