How often should I replace my spark plugs?

I've noticed my car has been running a bit rough lately and I'm wondering if it's time to replace my spark plugs. How often should I replace them and what are the signs of worn out spark plugs?

It is recommended to replace your spark plugs every 30,000 miles or every 2-3 years, whichever comes first.

Signs of worn out spark plugs include difficulty starting your car, misfires, and reduced fuel efficiency.

Regularly replacing your spark plugs can improve engine performance and prevent potential problems down the road.