86 C4. I am looking for some help with some vacuum stuff. I am replacing the hard plastic lines that run under the plenum. I know one of those goes from the EGR valve to the solenoid, and one goes from under the throttle body to the solenoid, but there are a couple more that I am not sure where they go. One connects to the fuel pressure regulator (i think) and then runs under the plenum to somewhere that I can not figure out. The plastic lines appear to be broken. Anyone know anything? Help greatly appreciated. Thanks!!