Before I changed anything in my PCM I captured a "right now" PCM image using the HP Tuners VCM Editor.
I then programmed it to purely stock GM settings using my Tech 2, and a single VIN AC-Delco TDS Service Programming subscription.
The HP Tuners compare function of the "Right Now" and the after TDS programmed images shows it was bone stock but it is 15 years old and I couldn't know for sure.
Account setup is free but you have to pay for Service Programming access... as of this writing Feb 2, 2019 the cost is $40 for 24 months single VIN Service Programming.
https://www.acdelcotds.com/acdelco/action/home
The Tech 2 requires a good quality RS232 serial connection. No device drivers needed in Windows 7. BTW DO NOT USE a USB to Serial adapter for service programming... the USB to RS232 device drivers cause signal latency issues so you could easily brick the PCM. I used a Quatech Expresscard-34 EXP34-SSPXP-100 (PCI-e) RS232 adapter in my old HP8560W Mobile Workstation.
This is the procedure for calibration updates with a Tech 2 in J2534 passthrough mode.
http://www.youtube.com/watch?v=53fho7l7yxI&t=657s
The same with an MDI.
http://www.youtube.com/watch?v=sUMJFwMuAkE&t=141s
This is a YouTube video of the procedure using a VXDiag Chinese J2534 passthrough tool. I'm leery of anything from China that requires me to install Chinese device drivers. A tool like this is no exception. IMHO A Tech2 or MDI is a safer choice.
http://www.youtube.com/watch?v=w1Cc-Nj6vkI
I should've put this further back in the thread but I didn't have a good howto til I found this video group from Dr Shock.
If you don't have a laptop with a good Serial port... The WiFi MDI clones are pretty decent quality now. Get the high quality unit with the SQU WiFi card and load it using the MDI manager from Bosch... not the one that comes from China on CD. MDI manager straight from Bosch has un-molested drivers.
http://www.youtube.com/watch?v=pZfXuuzORZo
You can use the hacked version of Tech2Win that ships with the clone MDI but the Tech 2 is lighter than a laptop and runs from the vehicle battery. The Tech2 will also talk to 1992-1994 ALDL and 1995 OBD1 vehicles. The downside is the Tech 2 costs more than the MDI and only supports vehicles up to around 2009 or 2010 with limited support for 2011-13.
The Linear flash card image BIN files that the SAAB guys put up on the
Tech2WiKi will work with the MDI and Tech2Win on 1996 and newer vehicles.
I have both a Clone WiFi MDI and a Tech 2. I just bought the MDI. I've had the Tech2 for several years.
http://www.youtube.com/watch?v=8d-z3EhL8Q0