difference. Then again, like you said. If his plugs were f*cked to start with, the coppers will give a noticeable difference. I'm going to just keep an eye on it and see what's going on. I drove to Ocala yesterday and the car ran great except when I pulled in to the parking lot and was noticing the idle was not as smooth as it usually is. I'm probably going to regap them tomorrow to 0.045 and see how they idle.