Q5 Audi Q5 3.0 TDI CCWA Revs down and up after start

KevinKoza

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Hi All

This is my first post so if I'm doing something wrong I'm sorry =].

From a year I have Audi Q5 from 2008 with 3.0TDI 240HP CCWA engine. 2 months ago after long weekend trip I've started the car and after 3 to 4 seconds revs dropped around 200rpm and gone up 400rpm then engine came back to normal revs. Since then around 3 times after start engine stalled straight away. Also issues with revs going down and up after start is happening more often specially on warm engine. I don't experience any power loss issues or any other problems while driving. It happens only straight after starting the engine. No error codes in ecu as well.
Any suggestions where to look ?

Thanks
Chris