i'm unsure where the vacuum lines go, mainly concerned from the a/c vacuum tank. it has 3 vacuum ports, 2 of them are going into the intake manifold (i have the non egr manifold) and the top one is not connected to anything. where does this one plug into and do i have the other 2 connected correctly?

thanks

 

Year?
Turbo or N/A?
Pics?

Have you checked out the FSM yet?

 

1979 n/a checked the haynes manual but couldn't find anything about it in there.

 

Yeah... you have those hooked up wrong.

3 lines on the vacuum tank:
-one goes to the vent selector in the cabin.
-one goes to the check port on intake.
-middle one goes straight to the intake.

The way you have the vent vacuum line from the intake, when you jam the throttle, all the vents will default to floor & defrost because there's no vacuum.

Scan from the Haynes / FSM:

 

great, thanks for that. just what i wanted and yeah thats exactly what it does