When I took it to the shop after the CEL came on, he hooked it up to a machine and it said the Cam Shaft Sensor was bad. I am not sure what the code was. I do know it said the Cam Shaft. He replaced it. When the code was reset the car ran fine until it was turned off and turned back on. I can go to Autozone Tuesday to find out the code for it. The noise is kind of a rattling sound. My husband says that it sounds like it is coming from the intake manifold.