When I'm at the stop light my GS shakes pretty bad the vibration causes the change/whatever I have in my cup holder to rattle it sounds very bad and cheap. Did you guys have this problem? If so did any of you guys fix it somehow?

What are your RPM's when in park,at a red light?

 

Try changing you transmission fluid, some have had success in calming down the vibrations.

Nobody has been able to find a cure for the AWD vibrations, they think its coming for the torque convertor. Which is why I suggested replacing the fluid, as transmission fluid flows into it. You can even use an upgraded transmission fluid like amsoil atf, do a drain and flush

 

Thank you! I'll try that

 

Have you checked your motor mounts?

 

Have u tried it yet?

 

whens the last time you changed you plugs

 

I had the same problem. 95% of the vibrations went away when i changed the motor/transmission mounts.