Just twist them back and forth a little bit, or get a flat blade and work it around. They're just stuck from being on there for a while. Two other thoughts, man: 1. The EGR bolts can be a pita, might want to hit them with something (penetrating oil) and let them sit while you work on the throttle body?? 2. Be cautious of the gasket between the plenum and lower intake - set the plenum down square & don't over-torque that secure the plenum to the lower intake.
Just a couple thoughts - those hoses will come off with some persuasion.
Jay