Had the car out yesterday for a short drive. On the way back home, I noticed a vibration at idle. Doesn't seem to be there when driving, just idling (stopped). Not like the whole car shakes, but it is definitely noticeable. I won't know till the next time I drive it if it's still there or not. Anyway, anyone else experienced this? I found that there are lots of posts about vibration in other model forums but didn't see anything under XTS.