Thank you for the help, redbull-1 and poorman212. It has been a long few days, and I ran out of time on the car. I brought the car to the mechanic and their conclusion was that it was neither the TPS nor the TCM.

Mechanic installed the TPS, and the same problem occurred. It is not the TCM because the voltage doesn't come from the TCM. He said that voltage comes from the ECU, and figured that it could have been a bad ECU.

Well I took the car home and cracked opened the ECU. Lo and behold, there were two capacitors that had burned out positive legs, and two other burned out capacitors. I was hoping I didn't have to spend money on a new used ECU, so I decided to swap in 5 new capacitors. When I drove it for the first time after the fix, the problem disappeared. It was as if the problem never happened! Previously, the car was had a surging issue when under throttle with a significant loss of power (when throttle was 100%, the engine wouldn't respond accordingly). Now, car is "back to normal".

Interesting note, however, was after driving 25 miles, I started seeing those symptoms again - transmission issue, shifting kind of weird, jerking motions when I step on pedal like a noticeable hesitation. Weird, I thought. Well, I concluded that there must have been something else in the ECU that was bad, might as well replace the whole darn thing.

I have an ECU coming in next week, I will report back.

 

With the new ECU in the car, I was able to test the car for the past few days. I am happy to report back that the ECU was indeed the source of the problems I was having - there must have been something else other than the burned out capacitors. Replacing the ECU did the trick.

Thank you everyone who helped in diagnosing this problem.

 

Glad you got it going and thank you coming back with the "answer" - too many times we never know how things turn out.