When at a stop, the idling is erratic - it dips down and makes the car shudder, but never has stalled out. I took it in before my basic warranty was up. The dealer told me, well we don't know whats wrong with it, but you could stand to get the throttle body cleaned - however that may not fix it. So after a full day without my vehicle, no answer. I am hoping this does not progress to stalling out.