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What are the common reasons for rough idling in an Audi 80?

I have noticed that my Audi 80 has been idling quite roughly lately. Can someone provide insight into what could be causing this issue?

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One common reason for rough idling in an Audi 80 could be a dirty air filter. It is important to regularly clean or replace the air filter to ensure smooth idling and optimal engine performance.

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Another possible reason for rough idling could be a malfunctioning oxygen sensor. This sensor measures the amount of oxygen in the exhaust gases and if it is not working properly, it can affect the engine's idle speed.

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A clogged fuel filter could also be the culprit behind rough idling. It is recommended to replace the fuel filter every 30,000 miles to ensure proper fuel flow and prevent engine issues.

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