What causes the engine to lose power in an Audi 80?

I have noticed that my Audi 80 has a decrease in power while driving, especially when accelerating. This has been happening even though I have been regularly maintaining the car. Can anyone provide some insight into what might be causing this and how to fix it?

Based on my experience, the most common reason for a decrease in engine power in an Audi 80 is a faulty mass airflow sensor. It is responsible for measuring the amount of air entering the engine and adjusting the fuel injection accordingly. A malfunctioning sensor can cause the engine to run too lean or too rich, resulting in a decrease in power.