David Bayer said, and I quote:
<<The signal from your hall sender is not making out of the
distributor (assuming the EV has the same distributor). These are the exact
symptoms that happened on my vanagon. My problem was caused by the plastic
elbow which comes out of the distributor to form a 3 wire connector
cracking
inside the distributor.>>

This is a totally different engine, but . . . good guess.  They are
replacing the distributor, which is electronic in this case, I guess.  If
there's a wiring problem there this should fix it.

But . . . I had a forever electical problem on a 75 Vanagon -- never
replaced the distributor.  It finally got modestly less annoying.
Everytime the dealer did something they must have moved enough wires to
keep them from shorting out.
I'll bet this was the problem.  Ah well -- almost all of that work was
under warranty, even though I kept the thing until 140,000 miles.

I'll let you know what they think it was when they think they've fixed it!

Thanks.  Folks -- you are a priceless resource out there.
Lots of traffic on this group.
Thanks.
Carl