I have a 99 A6 with the 2.8L 30V V6. The car runs well driving around but will misfire at idle. It's so bad that it will cause a flashing MIL. The issue is worst with light load (neutral). Misfire just about disappears in gear. Add in AC and it's totally gone. Misfire occurs on all cylinders and gets worse as it warms up. Things I've changed/checked: coilpack spark plugs cam timing smoke intake pressurize intake Throttle body adaptation O2 sensors (front) PCV is currently bypassed. No change fuel pressure regulator/verify pressure Compression test (220ish on all 6) fuel trims around 0 I'm all ears on ideas.