Eureka!
Thanks for the advice; I switched fuel pumps and installed a new fuel filter. That helped a bit...but for reasons other than fuel flow.
After doing the fuel pump, etc. I caught the motor back-firing when it stalled on a hill side. I immediately thought, "electrical problem."
I inspected the battery connections. Looked good. Next time I tried to start the engine, nothing. Nary a click. I checked all the safety switches for continuity...AOK. Hmmm...
I took the battery connectors off the battery to find that, when my service guy replaced the battery, he used the original split lock washer with no flat washer. The lock washer was compressed inside the negative lead through-hole. This allowed the lead to rotate, and made the battery and negative lead a perfect position switch: move the battery an eighth of an inch, and it became a high resistance connection.
Reinstalled the battery with the correct hardware, and the problem was resolved. Tank and I are happily running the hills again.
I thought I would let you know about this weird problem, and its solution.
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