My moneys on the Ignition Module, although the Crank sensor was a good posibility. Unless you think you got a bad crank sensor or the connector came loose or fell off since you replaced it. The car would still run crappy if one coil took a hit. The Crank sensor, Ign Mod, and ECM can all kill the engine as you describe, and then start up again like no problem.
The crank sensor signal goes to the Igniton Module. The Ignition Module drives the coils (spark). The Ignition Module is a flat pack about 4x8 in. directly underneath the coils. Its prone to failure over time due to heat, and this one is located up against the engine to the right of the starter. There's three connectors going to it: I believe Crank sensor, power, ECM signal. A shop can hook up to it while on the car and test it, or you can take it off and take it to NAPA or other good parts store. The Ign modules are not that uncommon of a failure on these higher mileage motors.
The ECM (Elecetronic Control Module, computer) is another possibility, but I think less likely due to its location up under the passengers side dashboard. This can also be tested if removed. If you decide to replace it, remember to switch over the EEPROM card from the old to the new ECM. The EEPROM contains the specific intruction for your make of car (timing advance, tranny shift points, etc.).
Not too much for either part considering the cost for a shop just to look at your car. The ECM is usually an exchange-core item.
Ignition Module shown Here:
http://www.partsamerica.com/ProductD...pe=194&ptset=A
ECM shown Here:
http://www.partsamerica.com/ProductD...pe=248&ptset=A
Good Luck!!