How to diagnose engine troubles in an Audi 80?

I have noticed that my Audi 80 seems to be running rougher than usual and struggles to start at times. I want to diagnose the issue on my own before taking it to a mechanic. What are the best steps to take in diagnosing engine troubles in an Audi 80?

First, try checking the spark plugs and ignition coils. Frequently, worn spark plugs and faulty ignition coils can cause rough running and difficulty starting in an Audi 80. If those are not the issue, it may be worth checking the fuel pump and fuel filter for any clogs or malfunctions.

Another possibility is a failing mass airflow sensor. This sensor measures the amount of air entering the engine and helps determine the proper air/fuel mixture for combustion. A faulty sensor can cause rough running and difficulty starting in an Audi 80. It is relatively easy to replace and can often be found at a reasonable price at a junkyard.