I've read in many places that the GM Hot cam is a bitch to tune idle on. From the specs and cam card that came with the kit I don't see where the issue would be. To me this is a really small cam. Its only a .525 with 218/227 duration. If you guys have any insight that may help out, I'm all ears. I guess I'm looking for someone that has tuned one of these that could share a little on the issues you may have encountered along the way if any. Cheers guys and thanks for looking!