I will track down those vacuum lines you're talking about. I know which ones you're talking about. I sprayed starter fluid and whatnot in that area, hoping to find something, but didn't. at least, the fluid didn't expose anything. i'll get more through with it tomorrow.
You're going to have to pull the battery tray and actually look at them, also bank 1 = pass side. (also side that #1 plug is on)
I'm sure that this is not part of the problem but if the mileage is over say..about 90k it's probably time for O2 sensors.