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Welcome Tom,
The best part is you have some spares now that you will use in the future, if for no other reason, to eliminate them as suspects.
There may be a clue left in the on board diagnostics (OBD), but it is primitive and probably wishful thinking you'd discover something there. Nevertheless, get familiar with it and get into the habit of checking for stored codes. A reference for its use is found in the 700/900 FAQ .
In the 89, you have three points of vulnerability you haven't yet mentioned. (1) the fuel injection relay, just to the left and 'round the corner from your computer, is prone to cracked solder joints and resulting heat failures. (2) the 25A blade fuse under the hood and its associated wiring attracts corrosion, interrupting the entire engine management system, and (3) the crank postition sensor (CPS), located (or hidden rather) at the top of the bell housing behind the motor, gets cracks in its cable admitting water.
Check the date code on (1) or just replace it altogether. If you solder, you can fix it. Replace (2) with a rubber sealed one you can find at Radio Shack or better yet, a marine dealer. Clean up the wiring. And finally, inspect the wire into (3) for cracks. A newer version uses a white tape to identify it where the originals had yellow tape.
Intermittents are the most difficult to locate, but your ability to restart seems to tell us it is an electrical problem.
--
Art Benstein near Baltimore
Give a man a fish and he will eat for a day. Teach him how to fish, and he will sit in a boat and drink beer all day.
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