I don't know if I am posting this in the right spot but I am new to this forum. I have a 2002 Audi A6 3.0 Quattro it 70,057 miles on it and is in wonderful condition expect...... While idling, and it doesn't happen in park, only when the car is in drive the engine shudders intermitently. it will idle at a normal RPM and then the needle will drop almost as if the car is going to stall and thats how it feels in the car as well. Also combined with this problem if I smash down the gas pedal the MIL light will flash. The shudder problem does not happen while I am driving at normal speed just when I am idling in drive. I hope someon can help me