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What causes erratic idle in an Audi 80?

Recently, my Audi 80 has been experiencing erratic idle, where the engine speed fluctuates unexpectedly. I have tried changing the spark plugs and cleaning the fuel injectors, but the issue persists. Does anyone know what could be causing this and how to fix it?

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One potential cause could be a vacuum leak in the intake system. Check for any cracked or disconnected hoses, and also inspect the intake manifold gasket for any leaks. Also, try resetting the ECU by disconnecting the negative battery terminal for a few minutes.

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Another possibility is a faulty idle control valve. This component regulates the engine idle speed and can malfunction over time. Consider replacing it if everything else checks out.

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