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Q: surging at idle and check engine light on? on 2001 Mercedes-Benz E55 AMG

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As the car reaches operation temp. from a cold start it suddenly starts to surge and run rough at idle.
(1) Answer
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Check engine light on? IAC Valve (Idle air control) is a possibility. Volyage should checked and the MAF (Mass Air Meter.) Let me know. Good luck.
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