2001 Audi TT bam engine, 75k full service history it’s had, cambelt, water pump, thermostat, spark plugs, fuel filter, air filter, pollen filter, full engine flush, fresh oil and filter so now to the problem and it’s a right pain when I go to accelerate 9-10 it’s like it’s holding back boost will build but the car won’t go anywhere the engine doesn’t seem to be misfiring at all and it drives perfect on partial throttle? Can anyone shed some light onto this I would really appreciate it? I can help out on mots etc if anyone needs them cheers