Vacuum leak causing rough idle?

[yaahoos]

305 , 1985 Pontiac Grand Prix ... this small plastic vacuum line that comes from a “T” at the back of the manifold draws vacuum at idle but is not connected to anything. ??? If I plug it, idle is still rough but it probably should go somewhere? Any ideas? I tried uploading a 20 second video but says “to large of a file”.

 

[hoffa65]

May go to heater controls.
Black and pink line run under blower fan and enter cabin lower passenger side firewall

 

[yaahoos]

May go to heater controls.
Black and pink line run under blower fan and enter cabin lower passenger side firewall

I did find a pink plastic line tucked under the fan. It had a rubber vacuum connector and it fit perfectly. I hope this fixes my rough idle and whatever else it was actually for ! Thanks again.... I knew you guys wud come through !

 

[hoffa65]

Pink line should go to heater hose control valve.
Should be 2 lines 1 black , vac from motor to controls, 1 pink , from controls to heater control valve