Hey guys, I need help with something. A few weeks ago my a4 2.8 started to jerk violently, it would shift gear and the whole car would knock, brought to a garage and the guy told me my transmission was going, so I had it changed, now every time I'd put it in drive the car would jerk, so I brought it back and he told me that I had unplugged the maf sensor, in fact I did. He plugged it back and now it seems to work fine, but it still did it it to me once when it was downshifting and I floored it, the whole car jerked, it gets scary. Does anyone have experience with that?

 

i think it might be a loose nut behind the wheel.