Not so much a problem, but I've recently got a 3.0si and during idle the revs move ever so slightly but you can kind of feel the fluctuations thought the wheel with a small about of vibration. I'm guessing it's moving 10-20 rpm if that. My old cars rev counter was static in idle, not sure if the z4s is just more accurate on movement or if it's the start of a rough idle issue? Might be looking into it too much because it's new to me but is anyone's similar?