Car engine misfiring a serious may be. Which engine performance and fuel efficiency negatively does affect, To fix it you can follow these steps.

1. Check the diagnostic codes

⦁ OBD-II scanner: To out the cause of engine misfiring, OBD-II scanner read for car diagnostic code. This will till the codeup where the problem is.

2. Identify the common causes

⦁ Spark plug: worn out or fouled spark plugs misfiring is a common cause. Spark plug in inspect if needed spark plug is change.
⦁ Check the ignition coil.
⦁ Check the fuel injectors.
⦁ Check the vacuum leaks.
⦁ Check the mass air flow (MFA) sensor.
⦁ Check the crankshaft position sensor.

3. Inspect the wiring connection.

4. Check the fuel quality.

5. Check the engine timing.