My car (2005 Acura TL 43.000 miles on it), while standing at a stop light engaged in drive vibrates a little but does much more when i press the window button to close even though the window is already closed. Pretty much by engaging the motor, it does it every time, the rpms drop and the car shakes. Is it a electrical problem or something to do with my motor mounts... what would cause such a behaviour because i dont remember it doing when the car was younger...

 

My first thought is that it's the battery, which is on the way out.

If not the battery itself, check the cable connections on the clamp and car ends-- the cables on the TL seem to corrode a bit more than most cars.