I have three problems with my 2009 Corolla. 600 Miles on the car.

1. Has a large cracking sound from the passenger side dash area of the cabin when I'm driving on a bumpy hwy.
2. The car dips down to 400rpm when I come to a stop light or sign. Then as I am idling the stop it then jerks back up to 600rpm. It seems as if the car is going to stall.
3. The car doesn't seem to have a consistent rpm that it idles at. The car seems to shake as if it's not getting fuel.