You probably have an air suspension problem. Go to "search" on this site and search for "air suspension".
You will be able to find dozens of other Lincoln owners who have had to deal with air suspension problems in one way or another.
You will also be able to read up on what these same dozens of Lincoln owners did to fix their air ride problem, the available options, lots of owner repair advise and "testimonial" type recommendations, etc.
As for me, my tools have been stolen, I have no place to work on my car and
even though I would prefer to try to fix the air ride with replacement parts, I
am probably going to go with the coil conversion because I can do it cheaper, faster and can maybe borrow my cousin's husband's tools long enough to fix my Mark VII in the street.