I am trying to figure out where a green vac line goes that is cuurently siiting on top of the t-case behind the dist...it is comin out of a harness with another vac line..there isnt much slack in it...any ideas???

 

If it's sitting on top of the transfer case, it most likely goes to the vacuum switch on the tc. It's a round thing with 3 or 4 vac lines coming/going to it.

 

Looks like this,

 

It's just a vent line. It should have a little elbow looking thing on the end of it. That elbow is a check valve. I spent days trying to figure out were it went. It sits right behind the dist almost looks like it should plug into the dist or to the intake. I finally realized it was a vent when one my buddies pointed out that the elbow was a check valve not a connection to something

 

I just looked and there is a green one to the switch, can't find the other end of it, but the FSM says there are 2 vents coming off of it, so ICEMAN is right about it being a vent.