I know this is an older thread but my car still does this...and now that im older and more knowledgable on this car, maybe I can describe what is happening better. When my car is in drive, and you have you foot on the brake, there is a slight shudder to the vehicle, mostly felt in the steering wheel, its not a huge shudder and the whole steering column isnt shuddering, but if you take you hands off the steering wheel, you can see the bottom of the wheel itself vibrating. I guess this could be normal, but as soon as I throw it into park or neutral, the shuddering stops, and the rpms move up about 100