i changed my engine

i recently changed my engine in my 92 saturn sc2 DOHC after i got done i looked to make sure all the hoses were correct but i noticed the vacuum hose on the back of the intake manifold i forgot it. could antbody tell me where this hose is supposed to be connected to. it runs without it but at a really high RPM. then i put my finger over half and it goes to regular RPM's. please help

what year was the donor engine?

it was from a 92 sc2

i think thats hose goes to the brake booster, the huge spaceship thing on the firewall behind the battery.

there is another hose on the front of the intake that goes to the PVC valve. and three more on the throddle body(from back to front, Evap, fuel pressure, EGR)