OK, after many suggestions (O2 sensor, thermostats, other wiring, etc) and
much checking (O2 seems OK) the thermostat temp sensor (the blue one on the
front left, heat sens #II-?) may be the culprit.  When the engine get warm
and starts running crappy I unplug it and it starts to run just peachy.
Now, it runs much better and doesn't stall out but it won't drive with much
of a load (slight up hill).  So, do I just replace this sensor or might it
yet be something else that I haven't investigated that the new info points
to?  PLease respond ASAP and thanks to all who have.

Eric