vacuum lines diagram

[blackjack]

hi,all
i need some sort of diagram for the vacuum lines under the plenum...problem is i have two hoses going into the secondary port throttle valve solenoid at one end,and an open fitting at the other end,with no hose attached to it...the car is whistling at idle,so i figured this is the problem...what goes on there? the shop manual is not clear about this...any idea?
bj