Thanks you all for your comments I have had more time with the car and checked things over in more details first of all it does not run on 3 cylinders I have made sure of that after finding out that the injectors are of the solenoid type so it was safe to disconnect while running one after another and they all seem to work so no dead cylinder still the engine on idle shakes a little and when I increase the revs it feels like it has a burned valve and when moving from with first gear the whole car shakes and feels underpowered so it misfiring at low revs at high revs it is not notisable as I said it starts well no smoke no noises no fault codes and live data looks good and compares well with previous data I have saved as this car is in the family and have saved all it’s data for 7 years