Hi everyone, I've owned my A6 Avant 1.9tdi se for 4 months now.After 1 week noticed no power at speeds of around 80. A 19 test and tune diagnosed air mass flow meter and changed same with reconditioned one.All seemed ok until I noticed that the kick in the back feeling is not there, only when running from cold. When warm the engine revs ok but there is no power. I love the car to bits. But please anyone what is the cure?