Hi, I have a similar problem. While in the NORM position and the car turned off the Back end sags to the VERY lowest position. However, In the HIGH position there is no chage in hight when off. (the vehicvle does go HIGH). One thing I have noticed is that when the engine is turned off after a long ride, There is a release of air about 60 seconds later from the front which sounds like a trucks airbrakes releasing air. Any thoughts on this?????