Try the vacuum line that is joining the two ports on the top of the throttle body pretty sure they should be blocked individally not linked together, some people leave it how yours is but they push a ball bearing into the line to block it off so it cant leak between the two.
Also check your water lines are hooked up from the metal lines on the side of the block near the water pump to the bottom of the throttle body, this controlls cold air bleed and should drop the idle by around 500 rpm when it warms up.