Ok, I replaced the plugs today with the NGK (stock as far as I can tell) plugs. They were gapped about .040 out of the box, so I left it at that. My old plugs didn't look too bad and came out gapped around .045-.047. But so far for the first day, the engine seems to be running much smoother! But..... my butt dyno says it's not as quick! Is it just my car or is it normal for power to kind of drop off from 5000rpm - redline? Still accelerating but not as quickly. Maybe I'm just gettin used to it, but it doesn't seem like that.
Oh, and like I said; the initial problem did go away for about a week a while ago, but came back. So I won't be completely happy until it keeps running smooth for a while.