A little closer to  seeing the light................ Last night red thru the protraining Digifant book, and Looked at the wiring diagram................Here are my discoveries.

After reading, I really focused on the idle stabilization system.  It seems that once the O2 sensor heated up, that was when the hunting, and stalling started to occur.  It appears that the signal from the O2 sensor splits before it goes to the ECU and the same signal goes to the Idle Stabilizer control unit.  So I disconnected that wire on the firewall to see what would happen.  Well.... a little hunting, but no more konking out...............Still not perfect, but that narrows it down.   

I drove the van in the neighborhood for 20 minutes until fully warm, with a/c, without a/c, etc, and no stalls....a little hunting when stopped in drive now and then, but no danger of stalling.  Many would go on from here and call it fixed, but I want everything to work as designed.

Maybe the green wire to the idle stabilizer control unit has a short?  Or maybe unit is bad?  Troubleshooting advice would be helpful here.  Mechanical is my forte, electrical I am not that clear on.  

TIA.
Adam P                              
81  Westy "The Brick "
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1988 Vanagon Wolfsburg 
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Used Vanagon Parts for sale (mostly aircooled)