I've been running them for 15 years now. I use them to adjust the ride height to keep the car level when going between different sets of tires I have.

Pontiac offered them as an accessory, so I never understood all the comments about how air shocks will destroy your shock mounts, or punch a hole in the body.

I've run regular shocks too, and yes, regular shocks ride a little nicer than air shocks, but it's not a night and day difference in ride quality.

If the shocks are tee'd into a one valve, and you have a leak only affecting one side, that's......weird! Even if it was an internal leak in the one shock, the air would transfer from the other shock, and both would go down.

If you replace the shocks with new air shocks, let all the air out at the valve first, then unscrew the hoses. Follow the directions carefully when installing new lines. There's TWO rubber rings and plastic piece at each end (at least the Gabriel's are like that). They recommend using soapy water on the rings before tightening, which works very well. And don't crank on the plastic fittings, just finger tight.