What is the most common issue with the Audi A5's engine?

My Audi A5's engine has been making strange noises and is not running as smoothly as it used to. What could be causing this and how can I fix it?

There could be several reasons for your engine's issues, such as worn out spark plugs or a dirty air filter. It is important to bring your car to a trusted mechanic for a diagnosis before attempting any repairs yourself.

Based on your description, it sounds like your car's engine may need a tune-up. This involves replacing the spark plugs and cleaning or replacing the air filter. It is recommended to have a tune-up every 30,000 miles to keep your engine running smoothly.

One possible issue could be a faulty fuel injector. This can cause rough idling and a decrease in engine performance. Have a professional check your fuel injectors and replace any that are malfunctioning.