Got a 1999 A6 2.8 Q, suddenly is giving me a rugh idle start since few days ago (I see from other post people having the same problem) in addition to that, now when I stat the car the temperature warning icon starts flashing in the clustes display, I have to switch the car off and on again to have it go, engine is totaly cold when the warning comes up.
Any idea please?
Thanks

 

There is a tech bullitin for rough starts on the 2.8. It includes a new cts, injectors, thermostat, and a carbon cleaning of the intake trackt.