the fuel filter is on the firewall like on 4th gens, right? its up high enough where all you do is discon the hoses and then raise the hoses up a little higher, just prop them up and they wont spill gas, (gravity helps us here as long as the pump is off).
i would also try the pcv valve and check your brakes and emergency brake too. you have cleaned the air filter as well?
btw, if a vacuum is busted you will hear hissing, you can take a straw and put it in your ear, or a piece of rubber hose and run it around the engine and hear a high pitched SSSSSSSSssss
how did you place? my dad took 3rd today in his class, (compact Mild)
just for ****s and grins check the tension on the throttle cable too, maybe its slack.