OK yea I'll try that, thanks. I had a suspicion that only after the R&R of the plugs I developed a miss but I had never had a problem before in any other car with new plugs. I thought of replacing the wires but I think I'll try the plugs first. Just an FYI, many years ago I crewed on a Nascar Winston West team. We dyno'ed our motor then tried the Splitfire plugs, we lost 7 horsepower ! But we still put the continengency sticker on the car. It seems possible my plugs are bad, I only get the miss under part throttle and under. Never at WOT and the Bosch plugs definitely brought the pep back into the Zetec engine. Very strange feeling, oh yeah, and when the engine is cold, only after it warms up. Thanks for your help, Ken

Ken, 99 Silver Frost SE Zetec Atx, polished alloys, Kumho's, Pioneer hi power CD/AM/FM. Factory spoiler (added) Audi side lites, Borla stainless steel muff. Stolen, recovered in pieces. Looking for another Tour, preferably V6, 5 speed.