It seems that you checked it with an ohmmeter. I think that there are different types of air control valves. Be sure you have the correct specs for your model. Also try shaking it (the valve). If you feel that the rotating piston is moving, it'S not stuck but it can be. So, you can clean it with carb cleaner. You can open some type of valves but not all. If it's sealed, you will have to clean it by the exterior, shaking it until it moves inside.