There's a vacuum hose coming out of the rear of the plenum that I believe needs to be replaced. I'm thinking it has something to do with the evap system? Comes out of the rear of the plenum, goes along the firewall, then down the passenger side towards the rear of the wheel well. I'm almost positive this hose is bad (I'll put a couple pictures at the end), just need to know what kind of hose I need, and how far it goes down. I've been having rough idle problems, and tried pretty much everything else, and figured I'd start looking at the vacuum hoses. This looks to be the only one that is a dried up mess though. Once you trace it back to the plenum, you can see where someone has wrapped it in black tape, I'm guessing to attempt to fix it without replacing it?