Just found and read your first thread on this describing the "sudden onset" nature of the malady. Strikes me now like back to ignition.

Do you have a tach or a timing light or some other way of making sure you still have hall-effect output when it quits? I can think of a couple common reasons your ignition might fail soon after starting, beginning with the hall sensor and pausing at the ICU plug and heading toward the fuse panel and ignition switch.
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Art Benstein near Baltimore