Thanks to everybody who replied on-list and off-list.  Lots of ideas and
suggestions.  The first one I tried (disconnecting the idle stabilizer
control box/Hall unit) made no difference.  Upon looking around for
additional clues and trying (sans even an Owner's Manual, much less a shop
manual) to figure out what things were what I noticed a blue plastic
connector with two female contacts inside that was hanging loose over on the
left side (facing forward) of the engine.  It has two wires going into it: a
white one and a blue/white one.  After looking all over the place within the
range (which wasn't much) of the wires a few times, I finally located a
matching connector pretty well hidden down under the coolant reservoir.  I
put the two together, drove a short ways, and turned off the engine.  Tried
to start it and it fired right up.  Yea!!  I then drove it about 7 miles
(home), parked it, and turned it off.  Started right back up again, so
apparently "problem solved."  Now, can someone tell me what that connector
is?  Maybe it's something somebody suggested but I couldn't identify it
merely by the terminology.

Norm