2004 Lincoln Navigator sunroof won't go down the last two inches

SOURCE: Problems with Gearshift 2004 Lincoln Navigator

Turn the key forward a notch then it should come out. If you are turning the key all the way off it enables the accessories (radio etc), locks the key in the ignition and disables the gear shifter.
If thats not the case then there is a button to be depressed so that the key can turn anticlockwise>off another click and the key can be removed.
It'll be one or the other....faulty ignition lock is the only other diagnosis

SOURCE: 05' lincoln navigator sunroof won't open and motor

The motor is stripped out. The sun roof might be binding on the sun roof track and the motor is not strong enough to move the roof. I would first replace the sun roof motor if available seperately.
You mihgt have to get the complete assembly because of part availability

SOURCE: po320 code and code po303 2004 lincoln navigator

Replaced a camshaft sensor still running rough & engine light still on, 2004 lincoln nav. 5.4 liter

SOURCE: 2004 Lincoln Navigator My steering wheel and air conditioner

If the air conditioner compressor is seizing it could cause the vibration you experience.

SOURCE: * Do 2004 lincoln navigator

2004 lincoln navigator has a gas based engine and requires premium unleaded fuel.