ThePmPowner

Hi,
I have a problem with my car,
itīs a 2006 Audi A6 2.7TDI Quattro with TipTronic gearbox.
When I am accelerating under load and around 1200-1800RPM the car shudder and shake violently. The problem goes away if the RPM gets above 1800 RPM.

Say if I drive in 60kmh with RPM around 1500 in 5th gear, the car shudders a little constantly and it gets worse when I accelerate, but if I put it in 4th gear and get the RPM above 1800RPM the car drives just fine without shuddering.

So far I have tried to replace both driveshafts in the front with no luck.
However, there has been two periodes within the last two months where the car has been behaving normally, and all of the sudden the shuddering reappears.

Whatīs strange is that as far as I can remember, the two times it has been coming back, was after I refilled the car with diesel.

Help is much appreciated!