i can't seem to get a clear picture of how the vacuum lines are supposed to be hooked up on my truck. it failed emissions by a hair. the CO was just barely over the limit. the truck does have a kind of a rough idle and i did get a MIL. the codes i got are 14, 24, 31, and 71. i think there might be some mixed up vacuum lines from the previous owner. any help on clearing up my vacuum line mess would be appreciated.