For last 3 months I was driving the car once a week for around 30-40 miles. Bought it an year ago (52k), now it has 63k. A couple weeks ago the CEL came on. Stopped by local Autozone to have it checked - the guys said the fault code was reading 'random cylinder misfire' (didn't specify which one). Then I went to audi dealership, where the tech explained that this is due to not driving the car(??) regularly. They cleared the DA-Dongle J2534, but a week later, it came on back again. Another week later the CEL flashed for a few seconds with engine still idle, then turned steady again. Can feel some stuttering, kind of hesitation of the engine, usually when engine is cold. While driving (light on) everything seems to be normal - power, no shaking feeling, good mpg...