Looking at the Engine.
* Left Side 1-2-3
* Right Side 4-5-6
Hope This Helps.
The Ford F150 was produced from the years 1948 to present in the United States. The cylinder 8 in a 2002 F150 4.6 is located against the driver side firewall.
It has a timing chain.
Fusable link? Check at starter solenoid
4 nuts under the dash around the brake pedal
Trouble code P0302 means: Cylinder 2 Misfire Detected
Image on the Firing order on a f150 2002?
firewall 4 - 8 3 - 7 2 - 6 1 - 5 front
The # 2 coil / sparkplug / engine cylinder is on the passenger side of the engine , 2nd from the front of the engine
Trouble code P0171 means: Fuel System Too Lean (Cylinder Bank 1)
If the check engine light is flashing that means an engine cylinder misfire has been detected
cylinder # 1 is the front cylinder on your straight 6
I have to believe that it would be a bad wheel cylinder that controls the back brakes.