what does it mean if my Ford F-150 is misfiring and running rough

Solution

1. Preparation

• Gather tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Replace Spark Plugs

• Remove the ignition coils using a socket wrench.
• Extract the old spark plugs with a spark plug socket.
• Inspect the spark plug gap and replace with new plugs set to the manufacturer's specifications (typically around 0.054 inches).
• Reinstall the ignition coils, ensuring proper torque (usually 10-15 ft-lbs).

3. Inspect and Replace Ignition Coils (if necessary)

• If ignition coils show signs of damage, remove them from the spark plugs.
• Connect a multimeter to check for primary and secondary resistance according to the service manual specifications.
• Replace any faulty ignition coils with new ones, ensuring they are seated properly.

4. Clean or Replace Fuel Injectors

• If injectors are clogged, remove them using a fuel injector removal tool.
• Clean them using an ultrasonic cleaner or replace them if necessary.
• Reinstall the cleaned or new fuel injectors, ensuring proper sealing.

5. Address Vacuum Leaks

• Inspect all vacuum lines for cracks or disconnections.
• Replace any damaged hoses or gaskets.
• Recheck for vacuum leaks using a smoke test or carburetor cleaner around suspected areas.