SOURCE: P0304=misfire in cylinder 4. coil?
not coil coil it wouldnt fire at all it is either a plug or a wire replace the wire and plugs and that will fix it
SOURCE: spark plug firing order
If it is a 2.5L dohc motor the firing order is 1-4-2-5-3-6 cyls. numbers from left to right 4-5-6 in front and 1-2-3 in rear thats looking at the motor from the front of vehicle.
SOURCE: I need a spark plug wire diagram for 1987 ford 302
1987 Ford Crown Victoria 5.0L FI 8cyl
Duraspark Type Plug Wires
The spark plug wires used with the Duraspark type ignition system are
5
/
16
in. (8mm) in diameter to contain the higher output voltage. There are
two types of wires used in this system, and some engines may have both
types installed. It is important to properly identify the type of wire
used for each cylinder before replacements are made.
Both types are blue in color and have silicone
jacketing. The insulation material underneath the jacketing on some
plug wires is a silicone layer separated by glass braid. The plug cable
not incorporating the silicone layer is used where engine temperatures
are cooler and are identified with the letter SE with black printing.
The plug cables with the silicone insulation are used where high engine
temperatures are present. These cables are identified with the letters
SS with white printing.
Each spark plug cable, if original, is
marked with the cylinder number, model year and date of cable
manufacture (quarter and year). Service replacement wires will not have
cylinder numbers, or manufacture date.
On any vehicle equipped with a catalytic converter, never allow the
engine to run for more than 30 seconds with a spark plug wire
disconnected. Unburned fuel in the cylinder may ignite in the converter
as it is exhausted and damage the converter.
When
removing spark plug wires, mark and tag the individual wires. Grasp,
then slowly, twist the insulator back and forth on the spark plug to
free the insulator. Do not pull on the wire directly as it may become
separated from the connector inside the insulator. Special tools are
available which can help ease plug wire removal, and prevent damage to
a cable.
When installing a new set of spark plug wires, replace
the wires one at a time so there will be no confusion. Start by
replacing the longest wire first. Route the wire exactly the same as
the original.
Fig. 1: 6 cylinder engine-240Firing Order: 1-5-3-6-2-4Distributor Rotation: Clockwise
Fig. 2: 8 cylinder engine-255, 302, 351, 400Firing Order: 1-5-4-2-6-3-7-8Distributor Rotation: Counterclockwise
Fig. 3: 8 cylinder engine-390, 427, 429, 460Firing Order: 1-3-7-2-6-5-4-8 DistributorRotation: Counterclockwise
Visit autozone.com (free register) for more details.
I hope helped (rememer rated this) Good luck.
SOURCE: removed spark plug wirers need firing order Ford Expedition 1999
Several engine sizes there...
1999 Ford Expedition 4.6 liter SOHC V-8 VIN "6" 
1999 Ford Expedition 4.6 liter SOHC V-8 VIN "W"
1999 Ford Expedition 5.4 liter SOHC V-8 VIN "L"
Hope this help to solve it (remmeber comment and rated this).
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