Is the vane inside the AAV closing? The AAV's vane is supposed to be open when cold to increase the cold idle speed. Then, as the engine warms up, the vane should close so the idle speed returns to normal. When the engine is running you can squash the hose to the AAV to block the passage of air. If the idle speed drops then the AAV is likely not closing.
If the Idle Adjuster's O-ring is old it may have taken a set and resist adjustment. A new O-ring is squishable so the ID can vary which is how the idle adjuster varies the idle speed.
If the Idle Adjuster's O-ring is old it may have taken a set and resist adjustment. A new O-ring is squishable so the ID can vary which is how the idle adjuster varies the idle speed.