Originally Posted by
spacemutt
Probably an air bag leaking, possibly the valve block. Jack it up and check the bag for leaks or signs of perrishing. If buying a new one be sure to ask for a new pin at the bottom and the two clips on top. You don't need to convert to coil. It will cost more than fixing the air.
water with soap in it, brush it, find leak go from there, no need to throw "spring kits" at it. you can find the bag parts all over ebay for cheap.
2004 DII HSE for my girlfriend, no mods, yet...
other cars and trucks, but this is a rover board.