Thanks for the replies and assist, it is much appreciated.

Throttle body reset: I did this twice before starting this thread. Once with the key in the off position and once with the key removed. Now I have done it two more times. I have also plugged-in an OBD2 scan tool. The scan tool is set to display throttle opening as a percentage.

Today’s road test: Ran the throttle reset procedure prior to the test. The car ran fantastic for 15 minutes and the OBD2 scan tool showed expected throttle position percentages after a few minutes of driving. Around 15 minutes into the drive, throttle response became sluggish. The scan tool readout confirmed that throttle position was responding sluggishly to throttle pedal input. Pulled to the side of the road and re-ran the throttle reset procedure. Once again the car ran fantastic.

Fuel pressure: The scan tool was not reporting fuel pressure. Pizzaguy, thank you for stating there is no fuel pressure sensor. This saved me time and trouble with locating and testing a non existent sensor. Got my fuel pressure testing tool out. It is for old-school carburetors. Time to upgrade the tool collection.

Electrical: Looks like I’ll be spending time in this area. The car and battery sat for two years. When I saw the car the battery was dead and had been dead for an extended time; it probably suffers from sulfation. The electrical system is probably accurately described by the statement “…filthy or low voltage.”