[s-cars] Re low rpm stumble

[George Verbryck]

Thanks for replys, plugs could certainly be changed as they have probably 40000 on them. However I pulled the codes this morning and found that 4411, 4412, 4413,4414,4421  (Blink Fault Code), 01249 VAG1551/2 Fault Code Number
  
    Fuel Injector 
    for Cylinder 1, (N30)

    Open or short circuit, +12V supply circuit breaker or fuse open

    Symptom: Engine
    runs rough or stalls
What does this mean ? The car runs so fuel injectors must be working to some extent? Where should I look for a short ? Is there a common ground for the injectors? Many Thanks, George