Originally Posted by speedyHAM
Look close at each coil pack for one that looks melted or has some bulging compared to the others. Sometimes that can tip you off to which one is bad.
Another thing to check is that your plugs are properly gapped. I had that problem on my car when I was in a hurry changing plugs one day and forgot to gap them properly. 4K rpm it started missing. Regapped them and it was good as new.
Like I said I had a very well known shop change them and I'm fully confident they did the work right. I'm going to check them out when I get a chance. But I think it's a coil or a fuel filter, any chance a fuel filter can get knocked loose? The day before it started happening I got on it real hard in 1st and bounced off of redline.