Unstable idle around 40km/h

STomHacks

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Hi guys,

I have and Audi A4 Avant B7 2.0t and I have a problem mostly when the car is cold.
As you can see in the video below, when I'm with a stable speed like 40km/h the idle is'nt stable, it's a bit difficult to explain but you can understand if you watch the video.

Do you have an idea for this problem ?
I thought about pcv valve or spark plugs maybe no ?



Thank you
 

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