The spark plug wire set comes with the resister boot, so they were replaced. They all seem to be seated properly with the "snap" when installing them. The spark plugs are indeed the plain old non-resistive plugs. An additional comment... when the enginer first goes into idle, it seems fine. It's only after it's been idling for a longer period of time when it feels like it's missing slightly. (So slightly, that you have lay your hands on the air clean when the hood is up to feel it. Otherwise, it seems like it just purring.)

I thought about the air mass meters, but wouldn't that also impact non-idle speeds?