electronic gremlins at it again. my story... please read/help...

[Nerfdude]

i've replaced my coil, my ICM, i've cleaned my IAA (which did fix my idle, i might add...) but i still have a problem. it's manifested in a couple ways... grab a cold drink and get comfortable, because this is a long pain in the ass of a journey.

about a month after i bought the car, it started dying at inoportune times. at a stoplight, in my driveway, driving down the highway with the car in gear... pretty much whenever. it didn't give any warning. it just did it at random, about once every 2 or three days. it would just die, and if you waited half an hour to n hour, it would start back up, no problems. the starter always cranks. while not starting, i checked the wires for spark: there was none.
this led me to believe the ignition system, or some part of it, was the culprit. so i replaced the Ignition Control Module, and it stopped dying for a while.
then it all started again, same symptoms. so i replaced the coil. again, no more problems for a brief amount of time.
last week, the idle irregularity got so bad that it started stalling itself. when it stalled, sometimes it would start right back up, other times it wouldn't start for a good long time. so, i cleaned out the IAA valve with some carb cleaner. the idle is now perfect, sitting at 750 rpm's with the AC off, 1000 when on. and up until about an hour ago, the car ran fine.
i work at domino's, i'm a delivery guy. hence, my car is kind of important. i parked the car outside the building, turned it off. ran inside, got another order came out- and the car wouldn't start. the starter cranked, but the car wouldn't start- i checked the lines for spark again, and there is none.
i'm ready to say it's either the distributor, the ECU itself, or the ignition system itself- but i'm not ready to shotgun purchase any of those high ticket items. anyone care to speculate on what my problem here is? please, any help would be greatly apprecitated...