Originally Posted by Yachtie
Also, where should this throttle cable "tensioner" screw be set roughly
Such that it has enough free play that it allows your idle adjuster screw to dictate idle speed and not cable tension. You also need to set each side so that your throttle "picks up" both throttle shafts off the idle speed stop exactly in unison. First idle speeds need to be synced with vacuum gauges or shorting sticks, etc. The next thing that needs to be synced is when the throttle picks up both butterfly shafts off the idle stops. That's done with those cable adjusters.