I decided to finally put in a kit I had bought a year or so ago. Really made a difference in the start up idling...did run rough until it warmed up but I'm here to tell you that if you are having idling problems you may want to pull that baby off and clean it up. Basically calls for disolving the carbon deposits on the back side and this can be a pretty good job when you're talking about pulling something off a 21 year old car. Mine hadn't been pulled before...carefull with the screws as they may break...I broke one off the butterfly plate. Gave up on the water jacket lid as I probably would have broken one or more on it. Soaked it overnight and used plenty of penetrating oil...just couldn't get them to break loose. All in all it turned out fine...motor purrs like a kitten. Oh, by the way, I used an article out of the tech center explaining and showing all the parts to the TB...CAC is really that good!