So my 1999 DII has the rear air bags. It sags only on the passenger side most of the time then it steered doing it on both sides randomly dropping while driving. I replaced the ride height sensors, and the driver's side stays up almost all the time. But the passenger hardly ever comes up. I can hear a hiss on the passenger side as if I have a leak. But here's the rub....

When I put it in of road mode it pumps all the way up and will sit in the drive for a week and never lower. A soon as I hit 20mph boom the passenger side is all squidgy and low. Looks like I'm driving a ghetto cruiser.. So if I have a leak, why does of road mode work