digdoug

I am having problems with my 2001 Camaro SS. It has a 325hp 5.7l engine and it will start but it there is a rattling sound, like shoes in a dryer, it runs rough and I can tell there is reduced power. Tried to go around the block it keep stalling out it would start back up made it home. I opened the hood and noticed smoke coming from passenger's side engine block. Can anyone help me out, I think I might have thrown a rod in the engine. Can anyone give me an estimate of how much this might cost?