Servus, Have an Audi Coupé 20V 7A Built 89 with 170hp. The car doesn’t really have power and the infamous thrust is missing at 4000… Sometimes he has a slight jerk between 2000 and 3000. Have already read out the error memory, but he says 4444, i.e. no error is present… Intake hose is also new… I checked it on false air and found nothing… Do you have any tips for me? Thanks already… mfg