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What is the root cause of a rough idle in an Audi 80?

I've noticed that my Audi 80 has a rough idle, and I can't seem to figure out why. Can anyone shed some light on what the potential root cause could be and how to fix it?

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The most common cause of rough idle in an Audi 80 is a dirty fuel injector. Try using a fuel injector cleaner or getting them professionally cleaned.

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