rear end of my civic is saggin big time. I bought this car and it was already lowered and I believe it has adjustable gas shoks because it has that knob dial thing on the shoks but that doesn't really do anything when I turn it.

anyways my car rides like a brick especially my rear suspension the whole car jolts big time every time I hit a little bump much less a pot hole.

Is there any way to adjust my ride height with these gas shoks? Do I need to put more gas in them? What is that knob on the shoks supposed to do?

Also would going back to stock suspension help raise my back suspension?