Got Gti 8v. Got it running fine but a flat spot around 4000rpm. Iv ha a look in the throttle body and thers 2 butterfly's and it sounds like its starving of fuel when the larger flap opens. Itl go right around when I feather the throttle but when stamp on it, it don't like it. Iv been told its the knock sensor or something but not a clue what it does or where it is. Anyone else had same problem?
