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Idle issue cold start - p0120

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Old Jun 3, 2015 | 03:55 PM
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Julio77270
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Slk 32 Amg
Idle issue cold start - p0120
Hello,

I have a very strange issue with Idle reving when engine is cold.
When I start the engine, 30-40s later the rev is oscillating between 500 to 600rpm. If I near the throttle body I can ear the flap adjusting by himself.
I have no the problem when engine is hot.

I have a code P0120.

My TB and my TB connector have been cleaned with no effect.

What do you think?
Somebody has had this issue?
I don't understand why I have only the issue when engine is cold...?

Thank you for your help.
Jules
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