ok i have 2001 mk4 boosted at 12 pounds. its chipped. the check engine light flashes nink its the vaccumow. there is a vacuum leak from the boost and o2 sensor is bad. it used to sputter when i boosted now it sputters when i accelerate. the coils are good but havent checked the sparks plugs.. and everytime it boost some weird noise comes out i think its vacuum leak from the boost .. what do you guys think it is?