[Will the duck]

My new 4cylinder matiz hunts badly between 1800 and 2000 RPM. Does anyone else have this problem or does anyone have any suggestions? My brother in law has an identical car with the same problem.Any suggestions welcome to, Will the Duck

 

[indiandrives1]

most of the time car are going rough between 1800 and 2000 RPM.....

 

[Steerpike]

Petrol isnt "ingredient" consistant! Every car's ECU will fine tune adjust to meet the programmed values

If it is a "new" fault then it's down to Air Flow or Electrical Shorting/Resistance!

I have a new engine in my Matiz and even that "Hunts"! yet it runs perfectly except for the MPG due to a Garage (Not FRF!!!) adjusting the ECU when the old engine was in the car.