Hello all,
Long time lurker, my first post.

I have a 1993 S10 Blazer w/ 4dr 4x4 vin W (cpi) 4L60e 3.73 gears.

Previous owner butchered the wiring and installed a new PCM.
By service code and calpak BBC, it should be a manual trans truck.
The transmission works and shifts fine, but i have a ton of little stuff that is intermittent and frustration is setting in.

I've been working on GM wiring since the Rochester Carb days. Lately I've sort of specialized in Fieros.
WinALDL has been the extent of my ecm dealings.

I've searched here and the whole web for the last three months trying to figure out exactly what PCM is in my truck.

I've looked art Tunerpro, but am confused by all the different possibilities of adf or adx files.
My problem ( i think ) is i need to know what PCM I have, but I don't know and everything I've found says to look art the PCM/calpak. Kind of a catch 22 position.

I feel like I'm missing something.

Is there a program to identify what I actually have?

I have a arduino usb fftl adapter and a laptop.
Just need a bit of guidance.

Any one able to tell me where to start?

Thanks a lot,
Don