2011 CTS gas pedal and stick vibration
 

Hi,
I just leased a brand new 2011 CTS sedan with premiun package.
I noticed every time I hit the gas pedal there is little vibration that embraces also the steering wheel and the shiftstick.
The vibration is stronger if the A/C is on.

Can you advice me if this is a known problem, if there is a fix?

thx