I have an 09 CC, 2.0T, MT with about 48k, APR stage I and Carbonio.
I have had this annoying engine hiccup right at 2750k where the power delivery is not smooth. It is like a brief pause and drop in power as the engine revs, followed by a resumption of smooth power. It only happens at 2750k and is most noticeable in 2nd gear, though I can feel it in other gears as well. It only happens under partial throttle. With anything approaching heavy acceleration, it does not happen.
It still happens in stock, but less noticeable.
At 39k I had the intake manifold and all injectors and plugs replaced along with a carbon clean. I had the hiccup before that work was done and still have it afterwards. No CELs with this.
Any ideas? Does anyone else have anything like this?