Thanks again to all who sent advice.   I made two interesting discoveries
investigating my problem that I thought  I'd pass along since others are
having similar problems.
     Discovery #1  Corrosion on  02 sensor wire,   the third wire on the
02 harness (black one) comes from the sensor with a female flat spade
connector,  and going to the ECU is also a female flat spade connector,
they are joined by a double ended male connector.
   When you pull the connection apart you will see one male and one
female connector, but I got curious and peeled the boot back going toward
the 02 sensor, I found the female connector to be slightly corroded, and
with computor signals any corrosion is bad news.  So I crimped and
soldered an new connector and for good measure I even applied a bit of
silicone dielectric grease to prevent  corrosion.
         Seems to run better, but I think the idle stabilizing valve fix
"might" of been my main culprit.

Discovery #2,  Air intake hose collapsed.  While removing the plastic
panel just forward of the right tail light that hides the Idle
Stabilizing valve relay, and which your air intake hose passes.  I found
the hose going up into the van body to be bent at a sharp right angle and
pinched closed,  How the old waterboxer was able to breathe I don't know.
 Haven't replace it yet, just disconected it .
    Steve   87 GL
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