The Continental has an "air ride system" from the factory.
Remember air shocks from the past to raise the back and stuff those huge tires in? Sorta' like that.
Either a hole has been worn in a hose or one of the bags.
It's a common prob. with the Lincolns.
Grab a chair, sit down, click this link and find what's in reality a less expensive fix IF you decide to
replace the entire system.... (Click on "replace the entire system")
Keep in mind your's can probably be repaired, but it's getting old and those rubber air bags under neath are getting old and fragle....