I've looks all over the forums too see what the problem could be so far I have found nothing. I was driving down the highway with my mom and my balt started to bounce the rpms like hell. The check engine light came on, and I could smell this horrible smell comming from god knows where. It was freaking the crap out of me. I'm taking it to a chevy dealer on thursday to see what the heck is going on. I'm posting this today to see if I can figure out what is wrong. I think its just a bad sensor. If anyone can shed some light on this subject I would much appreciate it, I know the SS community is smart and knows what they are talking about.
Thanks!
-J

 

Bring it to your local auto parts store and have then check the code for you. would be a great start at finding the issue.

 

did you run over an animal and it got caught in your engine belts? That would make a gross smell and bounce your RPMs.

Or maybe a cat went and hid in your engine bay?