missing vacuum hose?

97 3.9L 2wd Where the hose from PCV valve hits the intake, directly under that is a place for another hose. Noticed it when I heard a hissing sound! Plugged it up, but not sure if it went to something else???? Has rough idling too. Figured that was from bad catalytic converter, because it has fallen apart inside! (very expensive part)

just get a cat off a wrecked truck in the junkyard - u'll be able to find a 97-2000 or something that is in good shape snag that it will save u time an money....i gotta get back to u on the hose i can check an see what ur talkin bout its late an i need sleep lol