What are some signs of warped rotors? Hmmm, my two front tires are going bald at the edges, could they be the culprit? And the fact that you mentioned an idle problem...my car idles fine, with no fluctuation. It does, however, idle roughly just briefly upon start up in the cold morning. It idles perfectly otherwise, even when slowing down to a stop. I know my car is due for a tune up, so maybe your idle comment makes sense.