Hey Bro' those 1/2" ports 2 of em, one is your pcv valve that goes to the back of the intake between firewall and intake other 1/2" one goes to the brake booster . not my pic just pcv pic in general shows the 1/2" hose routing mine just runs from vacuum tree 1/2" to brake booster other 1/2" to pcv as shown hope ya fix it man.. gotta keep the fords strong and healthy for the chevy whoopins' heheheh. if this dont help post some pics of the setup so we can check it out.
__________________ 91'5.0 lx notch auto, Trick flow Track heat Intake,75MM TB,75MM egr spacer,75MM pro-flow MAF w/k&n filter velocity stack combo, high flow 3" intake tube 1" intake spacer, stock heads,stock cam,1.5" jba shorty headers, 2.5" pro-chamber h- pipe ,2.5"MAC cat back,3.55's 1.7 RR's 255lph, adj. aeromotive regulator, MSD coil,cap, rotor,wires. | 
holley system max 2 
