What pluigs and wires did you use?I had one at work that I used Champions in that were direct replacement.It would run great but had rough idle at times.Changed them and wires twice.Finally I had the manager get Champions from the dealer.Installed them and no more roughness.Weird I know as they were the same plug and number.Wires will cause a rough idle and sometimes a miss also.The wifes PT went thru it.New Autolite wires 2 sets.New plugs 3 sets.Id pull number 1 and it would have a track on the porcelian.It wasnt much.I finally used Advanced wires 2 years ago.No more rough idle or occasional miss.Rocky