I own a 93 honda accord wagon and had very similiar problems as you ... It
stalled one day right on the interstate... at random..
the car sat for 2 months while I ponderded the problem.. a honda expert
came buy one day and suggested that it could be the "igniter" I looked in
my trusty chilton manual and tested the igniter at auto zone for free...
and sure enough that was it.. 80$ but I checked and tried every thing I
knew of and no help.. this finially fixed it...

Hope this helps..
John K.