Hi, I have a problem when I知 sitting idle the car vibrates a bit but if I知 driving I can稚 feel it or if I知 idle in N it also goes away. It is not the engine mounts. I was told that the 2006 Audi a4 2.0 turbo has a carbon build up problem and that I should have the carbon cleaned off the valves. Anyone have any idea what it could be? Please email me if you have any suggestions. Thank You! There are no engine lights on the dash either.