Rough idling in 2007 Chrysler 300C

I recently purchased a 2007 Chrysler 300C. I have noticed that while idling, my car shakes slighlty. I have talked to some 300C owners who say that the shake is not uncommon with the 5.7 liter hemi. I am not sure that I buy that this is common of all 300s with a hemi, but have not dismissed the idea. Any thoughts about what might be causing the rough idling in such a new car?



Regards,



Jeff