The throttle balance screw is right between throttle bodies #2 and #3, in the center of the TB assembly but it is tucked forward. You will need a mirror and a flashlight (torch in some countries) to see it. It is a Cross- head screw (like a Philips head) with a spring under the screw. It is really quite difficult to find and even more difficult to get a tool to it and actually adjust it. You are going to need quite a few really bad words for this one....
There is also an air- bleed screw in each throttle body which are also tough to get to. They are straight- slot screws, set somewhat deep in a well so you will need a fairly small screwdriver bit to reach deep enough to adjust them.
Both types of screw require a 90 degree drive tool of some kind.
Best of luck,
Brian
Ready to do the throttle syncronization, vacuum instaled but i could not find the center adjusting screw 
I have been finding it, with a mirror but i could not find.
Any help ?
