very new to this so beg me puddin if a get summert wrong .. I have an audi a3 99 plate .. she has started misfiring and runnin very sluggish at low revs .. i have put a new coil pack on which made no difference . I then had somebody hook it up to their computer and it said that cylinder 1 was running intermitently .. i have put a new injector into cylinder 1 and yet again it has made no difference ?? suggestions anybody ?

 

Sounds like the power output stage module, located on the air filter box, google "testing the N122 module" this module takes the low voltage pulses from the ecu and convert it to 12volt pulses to the coil packs. Good luck!