Autozone's guides show you.

Webspark plugs are the heart of your vehicle's engine.

Webreplacing worn spark plugs can greatly improve your engine's performance and efficiency.

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Plug it back in to the ignition.

Before replacing the coil, add a dab of dielectric grease to the tip prior to installing it over the spark plug terminal.

For maximum fuel economy and peak engine performance, your spark plugs should be replaced every 30 months or 30,000.

How to Test a Spark Plug - AutoZone

Learn how spark plugs work and how to work on them.

Weba little dab'll do ya.

Webreplacing worn spark plugs can greatly improve your engine’s performance and efficiency, and it can be done at home with basic hand tools.

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