So, here is the story. My buddy was running at me with some popcorn. He was outside my car and I was inside it. So I started it and threw it into reverse(it's an auto). I revved without letting it get into gear, I guess, and then the tranny a bit and it sounded like it was dying, so I quickly put it into park and turned it off. Now, whenever I start my car, it starts just fine, but the idle slowly does down until it dies. I can give it gas to bring it back, though. I just need opinions? Did I destroy my car?