I bought a 2000 VW Passat 1.8T a few months back from this kid and he had flashed the turbo so it pushing 15psi. Everything in the car is stock and recently when i hit full boost the car starts to hiccup. I've tried to research this problem but i can't seem to find any solid info on it. I've heard it could be the fuel filter, fuel pump, injectors or bad hose somewhere. Does anyone know what it could be?