MMMmmmmm� For sure you have an electrical intermittent problem!!!! (The
worse one) I had my share last year, including corroded wire / connector in
the idle stab control box behind the right tail light. A corroded injector
connector (right front cylinder). A corroded / loose / cut OS sensor wire &
connector. A loose wire in the left firewall junction box (plug of 6 wire,
one was loose / partially out)� You want some more, I got some more�������

If he partially found the problem, tell him to redo the same procedure he
did first and double check each step he did. I will bet you that it's a
damn loose wire somewhere!!!!

A partially functioning ECU !!!! Mmmmm� Most of the time an electronic
parts / piece is fully working or not working at all. But if some of the
list member had partially functioning ECU, that's maybe possible.

I will have one of my friend (electronic engineer) study the ECU next week.
I have a non-functioning one right now and we will repair the sucker!!!!

By the way, I forgot, one of the pin (for the AFM - see link below) was
loose on my ECU connector.
Van was staling for nothing!!!!

Link:
http://www.loam.org/vw/Vanagon/VanagonProTraining/DigiFant/ (see page 40)

Cheers, Ben
http://www3.sympatico.ca/huotx/engine1.htm