Plug in an OBD2 scanner and read the trouble codes to identify which cylinder is misfiring.
Note the specific code (e.g., P0301 = cylinder 1 misfire) to determine which cylinder to inspect.
Turn off the engine and allow it to cool before working under the hood.
Disconnect the battery to prevent accidental electrical shorts.
Remove the ignition coil from the misfiring cylinder using a socket wrench.
Inspect the spark plug for wear, carbon buildup, or damage.
Replace the spark plug if it appears fouled, worn, or damaged.
Apply a small amount of anti-seize compound to the new spark plug threads if desired.
Install the new spark plug and torque to manufacturer specification.
Swap the ignition coil with one from a different cylinder to test if the misfire follows the coil.
Reconnect the battery and clear the trouble codes using the OBD2 scanner.
Start the engine and perform a short test drive to see if the misfire returns.
Scan the vehicle again to check if the misfire code has moved to the swapped cylinder.
If the misfire moved, replace the faulty ignition coil with a new one.
If the misfire remains, inspect the fuel injector on the affected cylinder.
Use a multimeter to check the resistance of the fuel injector and compare to specifications.
Replace the fuel injector if it is out of spec or not functioning properly.
Reassemble all components and ensure all connections are secure.
Clear the codes again and perform a final test drive to confirm the issue is resolved.
Rescan the vehicle to ensure no misfire codes return and engine runs smoothly.
