How to improve the performance of an Audi 80's engine?

I have been experiencing a decrease in power and acceleration in my Audi 80. What steps can I take to improve its performance?

Firstly, I would recommend checking for any clogs or build-ups in the air filter and cleaning it. This can significantly improve air flow and therefore, increase engine power.

Another important factor is to make sure you are using high-quality fuel and regularly scheduling a fuel system cleaning. This will prevent any build-ups in the fuel injectors and help maintain optimal engine performance.