hi new to the forum
please can you help i own a4 1.9 tdi 1997 afn i keep losing turbo power one min
and the next back again cold or hot and when i change gear
i have changed all vacum pipes put a new valve
next to the turbro i think it the n75 or contol pressure regulator i think it got at power chip fitted called powerlink all so think its got a new ish turbo it look to clean had the car 6 months
hope you all can help thanks stuart