I checked pressure - all 6 are 220 psi.
New spark plugs.
Only error codes are random cyl. misfire, no engine check light.
Engine runs fine at middle and high speed. Only when idle it vibrates-misfires.
I believe it is an oxygen sensor, but again- NO error codes VAG-Com???
Any good thread to follow?
Thank you.

 

O2 sensors can cause rough idling. How many miles do you have?

Is the car jus vibrating, or are the RPM's fluctuating or both?

 

Clean the throttle body. One of the most common causes of staling or rough idle

 

Ok, I replaced the primery oxygen sensors. They were bad.
The engine runs better, but still rough.

I run the car for 1/2 hour on the highway.

The Rediness Status for the engine now has the code: 0000 1100.

The bad fields are:

Secondary Air injection: Failed or incomplete;
Evaporative Emissions: Failed or incomplete.

What do I do next?
Thank you.