Doesn't start or shakes when idling

Do you have any warning lights illuminated on the instrument panel (Service Engine Soon)? You'll need to have a shop scan for the trouble codes stored in memory. If no lights are on, a very low idle can be caused by a dirty throttle body. It may also stall when you're coming to a stop. As the carbon builds up on the throttle body, the throttle is artificially closed more than it should be and the engine is choked off. hope this helps!