Sounds like the leveling switch is pooched or the compressor is pooched check both start with fuses
I also have a '99 Navigator that had that very same problem at then end of 2008. The problem is that your electronic suspension is gone. I had the dealership switch my suspension over to a manual suspension and that completely took care of the dropped back end and the bouncing. That truck is too large to be bouncing every time it hit a bump.
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