Screws?????
In my archive there is a picture of the Throttlebodies which have little screws on each bodie next to the injector, where are these for?
Air bleed screws to balance individual chokes and balance screw on linkage between bodies to balance the butterflies between the two sets of bodies.
What the dude with a dog in a bun said! oh i get it a hot dog! 
OK thanx.