How can I diagnose and fix a weak acceleration issue in my Audi 80?

I have been experiencing a lack of power and slow acceleration in my Audi 80. It used to have a smooth and strong acceleration but now it is struggling to pick up speed. What could be the cause of this issue and how can I fix it?

The most common cause of weak acceleration in an Audi 80 is a clogged fuel filter. This can restrict the flow of fuel to the engine and cause a decrease in power. To solve this issue, I recommend replacing the fuel filter and checking for any other clogs in the fuel system.