What is the relationship between air door tension adjustment and cruise AFR ? I understand that when you mash the throttle the secondary butterflies and air door should be set for a seamless transition. But what about a steady cruise ? I am referring to a 60-80 mph cruise speed. If the throttle plates are opening but not the air door are the secondary jets drawing any fuel in ? or inversely if the air door is set too light is it opening before the butterflies and if so what are the effects ? Which one creates the draw of fuel ?