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2001 M5 Irregular Idle

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When started from cold iron, the car idles irregulary oscillating up and down on the tach + and - 75 rpms from about 750rpms. Once warm, the car is steady at 750. Normal. This only last for about 20 - 30 seconds and then is ok. It seems normal.. Any thoughts would be great.
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Mine osciallates around 1000RPM down to 750 over a 1 minute warm up. My olf 525i did the same. When warm, it is fine.

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