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The Ultramatic front pump provides the engine speed input.
As the GM has engine speed from the engine electronics, there is one fewer function for the front pump.

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The Ultramatic rear pump provides the road speed input.
GM uses the electronic speedometer.
By excluding a rear pump, GM decreases their cost and probably more importantly, potential liability from push starting.

The Ultramatic does not use pump pressure for any logical function of the system. The only thing directly controlled by pump pressure is simply the valve with that chooses which pump to use; said valve also uses the governor pressure (in low gear only) and throttle pressure.

The Ultramatic actually does not care about engine speed at all, only engine throttle. Road speed is calculated using the governors.

Went to my last Cars & Coffee for 2025. 24-mile trip and no brake pulling and the brake lights were off when I stopped. The Patrician held a lot of attention. One gentleman remembered riding his bike past the plant when he was a kid. He spoke of the great display in front of the factory each Christmas. Curious if anyone has a photo. Another gentleman spoke of his father selling Packards at the dealership in Newport News, Virginia for ten years. For both of these men, Packard left a lasting impression.
On the return trip; however, she did not want to idle correctly at the stop lights and would slowly lose rpm till the engine stopped. It was cooler out, guessing my old nemesis, the carburetor: needs to be readjusted, or another vacuum leak. Either way, she is under cover.
My issue is doubt.
Wish I had a garage; because thinking of four months not maintaining her due to weather, I worry what is next to fail and my ability to fix. I have actually begun thinking about selling her. Is this common on bringing back a 69-year-old car?

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Well, at least it's not a Caribbean!

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I would think it's the coil. This can easily be tested with the aid of a spare coil. Next time you have a nice long drive like that and have the symptom, first confirm that the engine still has the symptom when stopped for a few minutes then restarted. Then, stop the engine again, remove the air cleaner, and attach a cold coil on (if you remove one mounting bolt beforehand, you can swap it easily). Start the engine again and check the operation.

This is better than replacing the coil since you can test it with a cheap used coil and definitely see the result. If it fixes it, buy a hot new coil.