The part that usually sits where the red box is broke off of the intake, with that missing do you think it would let air in?

 

it may but not a vacuum leak

 

after posting this i realized that air is coming in there anyways so i doubt it will give me the o2 sensor code im getting. im thinking a leak is the culprit

 

A leak after the MAF will cause a lean code if I remember correctly. Get a decent bonnet with the bracket from a junkyard and see how things go.