Ok,

I have a 94 LT1 w Heads/Cam with a LS PCM and Coil pack conversion from the previous owner. The car does not run well AT ALL, I attempted to access and license the 03 PCM with a friend of mine and it just wont let us license. I know from talking with others that 03 is drive by wire and heard this can cause ALOT of problems. The factory LT1 harness was modified and pinned for the 03 Vette PCM.

Questions:

Is the harness being pinned and plugged to the 03 PCM allow me to simply put in a 99-02 and begin tuning or will I need to repin etc?