I need to scan my lincoln aviator 2004 because is misfiring but i can find the plug

On this website (click link below) you finde fuse box diagram and description for Lincoln Aviator

Lincoln Aviator fuse box Auto Genius

When the evap monitor runs, any leak in that system
will allow unmetered air into the induction system &
yes, cause lean cylinder misfires (fuel trim issues)

You have a MIL Lamp on your dash & have checked
for codes, so you should already be at a shop & scan
the vehicle data for any or all problems

Coil on plug ignition system , is there B+ to the coil's ? Is the PCM triggering them on an off ? What's the compression on those cylinders . Does the vehicle have VVT - variable valve timing ? Cam phaser stuck . What engine does it have ?
Variable valve timing

when you fix the problem, the ight will go off. Find out why its on, have the engine computer scanned for a trouble code and that will point to the direction of the problem.

The COPS (coils) may have shorted the drivers in the PCM (computer). You should get a misfire code for each cylinder misfiring though.

Slim possibility, but very expensive unless you have a service contract.
LINCOLN: 1999-2004 Navigator
2002-2003 Blackwood
2003-2005 Aviator MERCURY: 2003-2004 Marauder
ISSUE: Some 1999-2004 Navigator, 2002-2003 Blackwood, 2003-2005 Aviator, 2003-2004 Marauder and 2003-2004 Mustang vehicles built before 12/19/2004 equipped with 4.6L 4V/5.4 4V engine may exhibit a runs rough, lacks power, and engine misfire, prompted by a MIL light and DTC codes P0301, P0302, P0303, P0304, P0305, P0306, P0307, P0308, and P0316.
ACTION: Diagnose engine for engine misfire concern. If diagnostics determine an engine misfire which is characterized by leakage through exhaust valve(s), only replace the affected cylinder head(s).
SERVICE PROCEDURE FOR VEHICLES WITH RUNS ROUGH/MISFIRE CONDITION:

1. Perform relative compression check on all cylinders. If abnormal, check cylinder leakage and actual compression for "low" cylinders refer to Workshop Manual (WSM), Section 303-00.
2. If leakage/compression check indicates a valve train concern, per valve train diagnostics in WSM, Section 303-00, replace cylinder head and cam assembly, pipe plugs and timing chain tensioner, per procedure outlined in WSM, Section 303-01.
3. If cylinder leakage and compression tests are inconclusive, perform misfire diagnostic, per TSB 05-22-8. NOTE: DO NOT TRANSFER SPARK PLUGS. INSTALL NEW SPARK PLUGS IN REPLACEMENT CYLINDER HEAD AND CAM ASSEMBLY. NOTE: THE ENGINE MISFIRE CONCERN IS TYPICALLY EXHIBITED ON THE LEFT HAND CYLINDER HEAD AND RARELY ON THE RIGHT HAND CYLINDER HEAD. UNLESS CONFIRMED, THE RIGHT HAND CYLINDER HEAD SHOULD NOT BE REPLACED AS AN "EXTRA MEASURE" SERVICE PRECAUTION. NOTE: THE REPLACEMENT CYLINDER HEAD WILL NOT IMPROVE OR REDUCE ENGINE HORSEPOWER OR TORQUE ABOVE ADVERTISED LEVELS.
   

I have the same problem and many have said i have a coil pack out - qty 8 at $50.00 /piece

take it and have computer scanned

If you have recently replaced spark plugs, one could be misfiring. Most newer engines are designed to run hotter, thus the need for double platinum spark plugs are needed.

THE PROBLEM SOUNDS LIKE THE COIL PACKS, THERE IS ONE FOR EVERY CYLINDER, LINCOLN WILL REPLACE THEM FREE I THINK UP TO 150,000 MILES. THEY WILL ONLY REPLACE FAULTY COIL(S).

is your check engine light on? if so go to advanced or auto zone they will check the code for free. Post what code it is and i can assist you further from there.