Ok so truck seemingly runs fine and has for 10,000 miles since the rebuild. But I was crawling under it the other day to take pictures for someone else and I found this hose. It leaves the firewall and is just hanging loose. Its the one with the red mark on it.
Rig stats
85 SR5 4runner, 22re, w56A 5 speed, bone stock.

 

Does your truck have Air Conditioning?

I think it is the A/C evaporator drain.

 

Yes I do have AC. Not working currently but as long as I didn't Homer it and forget a line this long I can be relaxed again.

Thanks

 

I am pretty sure it is the drain as well.

 

Going with drain. Thanks guys.