I have a 93 jetta with a 2.0. When i drive the car normally the car likes to shake and sputter, but if i give it gas the car runs great. Ive changed all vacuum lines, i changed the fuel rail and injectors (when i changed the injectors i noticed 1 of the 4 were different from the rest) but i still can't stop it from shaking and sputter when cruising. Any ideas why its doing it?