What does yours idle at, mines at 600rpm - this seems too low? I also notice movement in the engine and body of the car when its idling, like its running rough? maybe I'm over reacting - I have had cam tensioner problems whic could be related.
Mine idles below the 1000rpm mark when it is warm. Could possibly be around the 600rpm mark. The only time it hasn't idled around then was when the alternator was shot and it was idling around 1200-1500rpm. HTH