Good luck mate. The fluttering is annoying, but when you've had to put up with a car running on 2 cylinders all week, it doesn't really bother me anymore!
Do you get the flutter when booting it higher up the rev range? I generally only get it when hitting it from too low down. If I go from 4k rpm up I just get engine and exhaust noise. From 2-3k, in a high gear, which is a no no anyway, that's when I get the flutter.
Bet your car sounded like it was dying on 2 cylinders!!
I'm going to change my plugs ever 6k/6 months from now on I think. The performance benefits are worthwhile. The car goes like stink on new plugs.