Hi Tad,
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The only thing I can think of at this point is that somehow that washer pump gets grounded briefly ONLY when the key is first turned to 'RUN'. This causes the wipers to cycle just as they would when you wash your windshield. If this is true the problem wouldn't be the wipers as they are the symptom and not the cause. Short between the ignition switch circuit and the washer circuit? Is that possible/likely?
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You might be on to something there. I don't have any electrical prints that date back that far, but newer prints show that the 4 cycle thing is handled in the electronics in the wiper motor assembly. (when you changed the motor, I'm assuming you changed the whole thing and not just the motor itself) I also noticed that the wiper circuit is made hot by the ignition switch being in either Run or Accessories. If your wipers will work in the ACC position, does it do the 4 stroke thing when you switch it to there?
The newer prints don't show a switched ground to cause the washer to work. A positive voltage from the washer switch is applied to cause it.
Hope this might help,
Mack1