Yeah, I'm thinking that on the 99 I may have cracked the small one that goes around the passenger side of the engine bay, it was still pretty cold (-15/20 C) when we started taking it apart.

Actually are there any of them that absolutely need to be hooked up for normal operations? If it's not needed I'd like to cap it and see if the issue goes away, and then hook it back up and see if it comes back.