is my tranny tied into the vacum system {at carb air intake}?

Actually this truck has throttle body injection that is mounted in what looks like a carb. The flapper is for when you start the engine in very cold weather, it directs warm air into the intake so the air and fuel can blend and burn better. However, the flapper or ( thermostatic air cleaner ) needs to be open once the truck has run for awhile, or the engine will run poorly. The thermostatic air cleaner uses vacuum to operate the door.