TPS might be worth a test too.

I drove it back, it got to street speeds and highway, but it did hesitate a few times fairly consistently. Example: when I was pushing the pedal to accelerate to 60 lets say, she went to the 3-040 range as expected, then the engine "pulled back" or went "flat" and stopped acceleration, but if I kept the pedal position constant during the event, in about three seconds, the engine picks up speed and shifts as expected, as if whatever is causing the loss of power is turned off.

I'm going to clean and reset all of the engine grounds that I can find, check the connections to the ECM, and even swap it out and keep testing her between these steps. I also grabbed a TPS and will replace the existing one if the previous two don't change anything.

Thanks for all the thoughts or assistance!

Have you tried manually selecting gears? It almost sounds like it is shifting to overdrive too soon or locking the converter clutch too soon.

I have, and there seems to be no change in the issue. Downshifting does alter the engine and it revs higher, but returns to the bogged status (lower RPMS as if starved for fuel or air) when shifted back to a higher gear. However, a disclaimer, I'm not the most seasoned mechanic, haha.

I did get a Foxwell NT301 and saved some running data, can I send it or upload it somehow?

BTW, I hope the Foxwell is an OK unit to do this, or is there a better one?

To add to my reply above, two transmission shops have checked it and one stated it was an engine misfire, not the trans and the other stated it was the MAF.

Here'* an example of one of the "printable" moments that the Foxwell recorded, there are well over 50 pages:
Calculated Load Value(%)14.9
Engine Coolant Temperature(øC)93
Short Term Fuel Trim -Bank 1(%)-6.3
Long Term Fuel Trim - Bank 1(%)-2.3
Intake Manifold Absolute Pressure(kPa)71.0
Engine RPM(rpm) 1893
Vehicle Speed Sensor(km/h)20
Ignition Timing Advanece for #1 Cylinder(ø)-1.5 Intake Air Temperature(øC)51
Air Flow Rate from Mass Air Flow Sensor(g/*)36.42 Absolute Throttle Position(%)43.9
Location of Oxygen SensorsB1S12--B2S----
Oxygen Sensor Output Voltage Bank 1-Sensor 1(V)0.045 Short Term Fuel Trim Bank 1-Sensor 1(%)-3.9
Oxygen Sensor Output Voltage Bank 1-Sensor 2(V)0.105 Short Term Fuel Trim Bank 1-Sensor 2(%)N/A
OBD requirements to which vehicle is designedOBDII

Just test drove her again and got the error code:
PO102
Mass of Volume Air Flow A
Circuit Low

I replaced the MAF a few days ago. So I remeoved the new plastic one and replaced it with the original aluminum one (that'* clean as a whistle) and there was no change in the error code. Plus, I then tested it with my multi-meter, here are the results:
1) With the harness disconnected and the engine/ignition off:
All three wires (red, black and yellow) ohm-ed out as ground.
2) With the key in the ignition and it turned to run position without the engine on:
The power wire (red) had almost 13 volts, the ground (black) wire was grounded, and the signal wire had about 6 volts.
3) With the engine running and the harness attached:
I tested the Hertz with my TEST BENCH set to 20 Hertz and the signal wire (yellow) had a fairly consistent 2.14 hertz at idle (engine warm) and when the engine revved it smoothly went to just above 14 hertz and then evenly went back down to 2.14 when the idle was slowly released.

So it seems the original MAF is working within specifications?

To add to my complex testing, I ran the car with my Foxwell attached and the Foxwell has a (g/*) reading for the MAF during the events in real time. It seems it was registering 4-5 during idle and was at the 40-50 range when it was bogging down, but when it cleared and accelerated as expected, it was well into the high 60s and into the 70s. Is this something that assists? Both the original GM MAF and the new replacement AC Delco MAF are performing the exact same way.

From the above, I don't think it'* the MAF. Can your Foxwell export as .CSV ?

I looked up .CSV in relation to Foxwell NT-301 and couldn't find any correlating information, so I'm guessing not?

I found the yellow sensor wire that goes from the MAF sensor to the PCM wasn't clean when I used my Ohm meter, it showed about 1.71. I ran a new wire along the same route and spliced it into the existing connectors. The new test drive was markedly better in acceleration and speed. However, after clearing the code, it still showed ""PO102, Mass of Volume Air Flow A, Circuit Low."

I grabbed an older laptop in great condition with XP on it, so I could run the GM program to flash the PCM, I'm loading XP Professional on it with Service Pack 3 so it should run it properly, and I'll "flash" the junkyard PCM first to my daughter'* VIN and see if that fixes the issue. Sound Like a good plan?