What is the cause of reduced acceleration in an Audi 80?

I've noticed that my Audi 80 has recently been experiencing a decrease in acceleration. I checked the engine and it seems to be running fine. What could be causing this issue?

Have you checked your air filter? A dirty or clogged air filter can greatly affect your car's acceleration and performance. Make sure to replace it regularly to maintain optimal performance.

It could be a problem with your spark plugs. Worn out or faulty spark plugs can decrease power and acceleration. Consider having them inspected and replaced if necessary.