I have a vacuum line on my truck that is not connected, the truck
>idles rough and the oil pressure goes down when idling. I don't know
>if these are related in any way.
>
>There is a black "flex conduit" coming from the rear of the plenum to
>the passenger side. It has five vacuum lines: two red, one black, one
>light green, and one light brown/tan/dirty white(???).
>
>The light green line T's off the main conduit and after passing
>through another section of flex conduit, connects to a part mounted on
>the top-front-left of the engine.
>
>The two red lines enter a "Y-connector" and become one red line which
>connects to the charcoal canister. The black line also connects to the >canister.
>
>The fifth (light brown/tan/dirty white) line is just hanging there.
>It's not very long, and I have tried to find anything that it can
>reach, to no avail. Does anyone have any idea what this line should be >connected to?
>
>Thanks!
No idea, but if it is just hanging there have you tried putting a screw in the end to block the hose.