My car has developed a overfueling problem!,over 2,000 revs fine!,under black smoke wrong idle!,it started overfuleing while away in holiday,so found a local audi delership to have a look after i checked most common faults!,they said it was a maf sensor so changed that still the same!,one coil pack looked black so changed that with a set of plugs,still the same,then changed temp sensor ,same!,have cleared fuel rail and fuel return pipe done compresion check!,only thing on diagnostics coming up is cylender 1 and 2!,but surely is due to fueling isue!.the car was mapped one month ago!,only thing i can think is a faulty ecu!,please help i hav spent £550 already!,car is booked back in with tuner race developments for friday!