Chevrolet Cavalier Engine Rattle

My Cavalier Had Developed A Rattle Under The Hood, That Was Diagnosed As A Water Pump Going Out. I Put It In The Garage With The Intention...

While Driving Started Hearing A Rattling Noise From Under The Hood. When I Came To A Red Light The Car Turned Off And Now It Wont Start.

My Engine Is Running Rough. It Seems Fine In Park. When The Car Is In Drive It Rocks Lightly Front To Back. There Is A Slight Rough...