An engine misfire is when one or more cylinders doesn't produce power, and there are several possible causes, from a fouled spark plug to a clogged fuel injector or faulty oxygen sensor. ... Fuel economy also is likely to suffer, and emissions might increase because unburned gasoline is exiting the engine.

How do you fix an engine misfire?

Inspect the spark plugs for signs of damage.

Use a spark plug socket to remove the plug so you can get a good look at it. The damage you see will help you determine the cause of the misfire. If the spark plug is just old, replacing it may solve the problem. Make sure to replace and properly gap new spark plugs.

Can a misfire ruin an engine?

An engine misfire can be caused by bad spark plugs or imbalanced air/fuel mixture. Driving with a misfire isn't safe and can damage your engine.