Theres only two hoses at the throttle body, one that points up and one that points to the air box. Would be a good idea to change them now if they are soft, I say this because mine split, causing a pretty good leak. The one that point to the air box (front ****** on throttle body) comes off the IAC heater block. The hose that points up (rear ****** of throttle body) comes off water outlet on rear crossover tube. There is a hose ****** on the thermostat housing also but that goes to the other port on the IAC heater block. I hope I answered your question. What vacuum lines are you talking about?