I started the car today and it had serious vibration from engine while it was still stationary(I turned on air conditioner as soon as I started the engine. Vibration started after I turned the air con on.) I stopped engine and restrated again. After that, car moved only 20m (3-10km/h) and stopped again and engine light was on. I restarted five times, engine immediately stopped after an approximately 2 sec vibration. Last try, I pushed gasoline puddle down harshly while I started the engine, car "ran" out of parking lot smoothly and enerything looked okay then. I drove back to home, restarted it three times and everything still looked fine(engine light is out.) Should I pay more attention on spark plugs? I do really appreciate your advice!

2008 S6 69700km

 

I would say check the coil packs, get it scanned and it should tell you what the issue was. Hope that helps.

 

Thank you 1move, will check it and post update!

 

+1 on coil packs
Last week as i was merging on the highway i pused barely the gas pedal and i saw the engine light flicker...then i tried once more harder and it started running very very rough and almost not going forward. I immediately went to my mechanic and indeed one of the coil packs was gone.
Mind you 2 years ago Audi did replace free of charge my 4 coils, however i am going this week to replace all four with a revised updated version of the coil packs
Hope that helps...

 

I really appreciate advices you guys provided!!!! Similar problem happened twice while I stopped at red light today. Got the car parked in garage and booked an appointment with Audi dealership. Will let them check coil packs on 9th. Updates will be posted! Thanks again!!