2002 lincoln town car wont run over 20 mph and wont rev up the coils have been changed and was not the problem

Check the tires air pressure. It happened to me 01lincoln town car, .had 60 psi in the front and 35 psi in the rear. This effectively gives you twould different tire sizes front and rear, the problem is that the speed sensors are reading two different mph from front and rear tires and causes the computer to go into limp mode. The Solution is to check the air pressure in the tires and make sure that all 4 tires have the same psi. Sometimes it's just that simple

Happened last year too, but now it started all over again, someone mentioned 02 sensors.

Sound like a clogged fuel filter this will keep you from going over a certain speed as the flow of gas is not correct