hey guys, new memeber also a new audi owner, ive searched and didnt find anything quite the same as my situation so, sorry if i missed it.
but i just bought the car 3 weeks ago and about 550km after i bought it i got a c.e.l... no biggie it didnt affect its running or driving but recently it started to stumble on idle. drop about 300rpm and come back up. and while accelerating if the pedal is 50% or more down the car sputters. light throttle/low load on engine it doesn't do it. i checked the codes and it says cyl. 4 misfire and p0411 secondary air injection system incorrect flow. apparently a common code.
the car has a new air pump from previous owner installed. other than that i think its all untouched. the car is stock.
thanks in advance!