What are signs of faulty spark plugs in an Audi 80?

I have noticed a decrease in performance and increased gas consumption in my Audi 80. How can I tell if the spark plugs are the problem?

Faulty spark plugs can lead to reduced engine power, misfiring, and difficulty starting the engine. If you are experiencing these issues, it is important to check your spark plugs.

One way to check for faulty spark plugs is to visually inspect them. Look for signs of wear and tear, such as a worn electrode or excessive buildup of debris. Replacing them if necessary can greatly improve your Audi's performance.

A decrease in fuel economy can also be a sign of faulty spark plugs. If your Audi is using more gas than normal, it may be time to have the spark plugs checked and replaced.