What is the cause of poor idling in a Audi 80?

My Audi 80 has been experiencing issues with poor idling, where the engine starts to sputter and shake. It usually happens when the car has been running for a while and especially at stop signs or red lights. Can anyone help me diagnose and fix this issue?

The most common cause of poor idling in an Audi 80 is a dirty or faulty mass airflow sensor. This sensor measures the amount of air entering the engine and controls the fuel injection accordingly. If it is dirty or malfunctioning, it can disrupt the fuel-air mixture and cause poor idling. I recommend getting the MAF sensor cleaned or replaced if needed.

Another potential cause of poor idling in an Audi 80 is a clogged or worn out fuel filter. This filter is responsible for removing dirt and debris from the fuel before it reaches the engine. If it becomes clogged, it can restrict the flow of fuel and cause issues with idling. I suggest replacing the fuel filter every 30,000 miles or as recommended by the manufacturer.