Update number whatever it is! lol.
There was a vacuum tube with a connector right under the throttle body, I guess it goes to my EGR solenoid? I don't really know what it is...
Anyway it was sucking air. I replaced that with some 7/16" fuel line, made sure it wasn't sucking air anymore. No apparent leaks from the EGR or anything else, and no CEL's yet... Let's keep our fingers crossed!
Thanks again to everyone for the input and tips and tricks.