When I purchased this car, I never experienced this "rough" idle...When I put on my CAI, there wasn't a rough idle....What in God's name could it be? I've taken it to the dealer, and they say that the computer they hook up to it, doesn't show any problems. My wife can feel it in her seat, I can feel it in mine. What the hell is causing this? Is anyone out there with a 05 A4 having this problem?