Tonight I ran through all the Bentley checks for the ECU harness, and
found no problems, even while violently jiggling/pulling on the hall sender
wiring. I added a large ground directly from ECU 19 to the block, no
change. The van will now barely run 10 seconds without stalling.

I've checked everything that has been suggested so far I think, but plan on
checking the timing and idle again, just in case. I don't believe the timing is
off, since it did run very well until just recently, when it wasn't bucking and
sputtering. The hall sender still sounds like a likely cause, but short of
building a Digitool, I can't see any way to actively monitor it, and it checks
out fine with engine off.

ps: I found the ECU 19 ground (separate brown wire from harness) does
indeed end in a ground stud under/behind the water tank. This is on an '88
Westy, CDN model.

--
Shawn Wright
http://Zuiko.sls.bc.ca/swright
'88 Westy 375k
'85 Jetta D 263k
'85 Jetta TD 482k (retired)
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