Whenever I have the air conditioner on and Im at a stop with the car in drive, the car shakes bad and I hear rattling. When I have the car in Park its fine when Idling. Only gets bad when in drive and at stop, also my car is an automatic.
I was thinking it could possibly be mounts causing it but not sure. Any help would be appreciated. Thanks!

 

Could be mounts or the engine idle is low. Set it a little higher and it might solve your problem.

 

Thanks for the help Im gonna check it out.