Just got my A/C charged up, after a year of having no a/c... So i notice when i was driving, that whenever i turn the a/c on the car wants to turn off but it gets back on its track and doesn't turn off.. When turning on the a/c you can feel the engine bay vibrating really hard, and it feels like it wants too turn off?
Any suggestion on what I should be looking at too fix this problem?

 

btw i have a broken motor mount? is it because when turning on the a/c it puts more load on the engine, causing the engine to vibrate more? it only does this at idle, not when i am accelerating.?? is this true?