What could be causing my Audi 80 to have poor acceleration?

I've noticed that my Audi 80 has been struggling to pick up speed when I accelerate. It used to have good acceleration, but it has been getting progressively worse. What could be causing this issue?

It could be a problem with your fuel filter. If it's clogged, it can restrict the flow of fuel to the engine, causing poor acceleration.

Another possibility is a faulty spark plug. If it's not functioning properly, it can affect the engine's performance and cause poor acceleration.

You may also want to check your air filter. If it's dirty or clogged, it can restrict air flow to the engine, which can impact its acceleration.