Ok, we didnt know you already had the 2002 OS loaded. If you have the 12212156 OS now, then ignore our last posts. We assumed you had the stock 2000 OS. It doesnt matter what the OS was before at all now, 12212156 is THE one to use.

Joe and I assumed: 2000 OS with VATS, EGR, etc removed.
Actual: 2002 12212156 OS with VATS, EGR, etc removed.

The files we posted are for 99-00 guys who are still running their 99-00 OS and want to migrate to the 2002 12212156 OS, basically a forum member took the stock 12212156 OS and ported the 99-00 values into it so anyone wanting to do this swap has 1 less step (copying the 99-00 tune to the 02 one).

Dont worry about the 99-00 differences, since you have a 00 engine compare that with the 2002 OS.

Hopefully that clears it up a bit.