Update: I bought new NGK Iridium plugs at Autozone (they were out of the standard copper). Gapped them to .044 per what the guy at the counter said. Took it for a test drive and it seemed to run well until I got home and let it idle a bit, then it started acting up again.

I've been driving my wife's car for a week and a half or so, since the weather had been a tad on the cold side and she is recovering from surgery. I bought some new plug wires from the dealer (about $12 each) and I pulled it all apart again a few nights ago. Regapped the plugs to .030 based on some info I found elsewhere and swapped out the wires. It's been running perfect since them. I'm keeping my fingers crossed!

Thanks for all the suggestions.