This trial is testing an inhaled medication called treprostinil for people with a specific lung disease (sarcoidosis) that causes high blood pressure in the lungs. The treatment aims to help these patients breathe better and exercise more easily by widening their lung blood vessels. The study will also check if this treatment is safe for them. Inhaled treprostinil has been shown to improve exercise tolerance and has demonstrated safety and beneficial effects on hemodynamics, exercise capacity, and quality of life.