Most of the time cars vibrate when you turn the A/C on, but mine is the other way around, when the AC is off the car has a lot of vibration, if I turn on the A/C it will stop vibrating, I already went to the mechanic, they used the scanner and they can't find anything. I just changed the spark plugs and no change.
This doesn't happen all the time but it does most of it, any suggestion of what should I check?