[pcmos]

I can't really elaborate right now because I'm at work and in the middle of a few different assignments. I noticed your post and had to jump in. Check the spark with an inline spark tester (Approx. $3 Harbor Freight). Move the tester to every plug location and run the engine. If you find a dead spark with the tester, don't immediately suspect the coil pack. Swap the packs on the Ignition Control Module and see if the problem moves with the coil pack or stays in the same location. If the problem stays in the same location, replace the Ignition Control Module itself.

I had the exact, and I mean exact, failure on my 2004 recently. Please avoid buying an AutoZone or aftermarket brand ICM if it does turn out to be the problem. They are total junk, I went through two of the AutoZone ICM units before finally just buying an AC Delco part on RockAuto.com. If the ICM or one of the coil packs is to blame, it's really easy to fix and you'll notice an immediate change when you restart.