Is that hose loose or is it plugged into the bottom plate of carb
There is a hole in the carb under the TPS connector and a little to the right as I recall. Start engine and see if you can feel around for vauum
It may be the port for the Vacuum sensor that should be mounted on the passenger side front inner wheel well.
Just like with wires, a GM service manual would be one of the best sources to se how the lines are to running. Good chance an p/o might of change the routing of a few.
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