i searched but cant get a direct answer when i put start my car the car shakes a little idles at about 6-700.. but when the ac is on it idles up and down and can get as low as 200 before jumping up.. only happens when im stopped no shaking when driving.. just changed the plugs they were burned to **** but car still shaking.. enlighten me guys thanks

 

like when u slow down it shake or what?