I have a 1997/98 late 97 production date? On my turbo there are two what seem to be vacuum lines? One [red coated] is producing air the other [blue coated] does nothing or it seems. The blue one goes to the actuator. Should I have a positve vacuum in this line? Both lines come from a n75? as I am not sure. There are three lines total to the unit and two wires. The third line goes in front of the the maf feeding the turbo. I have a lack of turbo pressure at high rpms. All vacuum lines are good and sensors all seem to be functioning. Any ideas???