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While warming my 1980 up I found this vacuum line just hanging out. It hooks to the intake manifold under the carb and I couldn't find a place where it should plug in. In the pic my finger is under it and it's where it plugs into the manifold. (It's not the one with the green marks on it). It definitely has suction and the truck idles a little rough. I looked all over and couldn't find a port that it goes on.Attachment 22743Attachment 22744
attach a vacuum gauge to it and rev up the engine - if the reading is high at idle and drops when you rev it up, it is manifold vacuum. If it is low, and rises when you rev it up - it is ported vacuum. Do this test with engine at operating temperature.
Got a vacuum line routing sticker on the engine compartment hood..? The green stripe is a key identifier but I don't have the answer... I have a factory service manual for 1986 Ram 50 (it's not at the house right now; perhaps it has a clue..?) You'll get it figured out sooner or later; need a few more pro's to chime in...
looks like its the intake manifold vacuum hose. i believe it plugs into the air bleed valve on the underside of the air cleaner