Hi guys new to the forums so I'm hoping someone can point me in the right direction. I've just bought an a3 2.0 TDI 8p and as soon as I get to 70mph the car loses all power and doesn't seem to go any faster than 45-50 mph but it's fine once I turn the engine off and it's fine if I stay below 70mph any takers on what's wrong thanks guys
Matt from Manchester