Vibration with ac on only in drive while sitting, not problem while driving.

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Runs very good while driving down the Rd with AC running, med vibration at stops. When I shift to nuetral it's not as bad but still has some vibration, shut off ac it's fine. Going to see if it changes with warm up or warmer weather today. Thanks on point I recall the idle slightly below 1000rpm not now, seems to be sensitive to types of fuel. Serviced the car after purchased it with: new plugs, wires, cleaned the throttle body. When the ac is off there is very little vibration! A mechanic said it's the motor mounts but why would it only vibrate with the ac engaged. Any help would be greatly appreciated. Thank you! Raylene