2007 navigator with 160000 miles exhibit engine issues, it will move at 55miles on 2007 Lincoln Navigator

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
but will shake and lose power at rest or light
(1) Answer
(1) Comments
Vacuum leak, low compression on one or more cylinders or misfire. Light on?
yes enhgine light is on , its been seen by three mechanics for $480.00 and all of them is pointing to a engine