Car vibrates at almost any speed other than idle. i have had the car back to the dealer several times. the vibration can be felt through the steering wheel, the seats and on the dashboard. i can't get the car fixed. i have asked audi to replace the car if they can't fix it. no response. i had 5 audi a8's in the past and never experienced any such problem i am almost afraid to drive the car. i leased the car for 15,000 miles per year and only have 7800 miles in 11 months because of this fear.