Plastic pipe rear of engine

[sweep 500]

OK 3.0 S type, the rubber elbow on the rear of the engine , there should be a small plastic pipe connected to it, where does this pipe go to, been trying to find a air leak and found this pipe missing. 

[sweep 500]

On 11/21/2022 at 8:13 PM, sweep 500 said:

OK 3.0 S type, the rubber elbow on the rear of the engine , there should be a small plastic pipe connected to it, where does this pipe go to, been trying to find a air leak and found this pipe missing. 

I never explained myself very well, its the rubber elbow on the rear of the inlet manifold, should be a vacume pipe connected to it mine is missing, where does this pipe go to, I am having a air leak code.