Hello i replaced my ecu and alarm module and ignition barrel in my 03 mk3 mondeo tdci had injectors programmed to the ecu. the car is in limp mode now and surges at idle can anybody tell me what i need to do to fix this?

 

with the ECU being changed it will have been "reset" and needs to "relearn" try driving it around to give the ECU a chance to re-learn (there is a procedure for doing this - i can't remember what it is but just driving it works too) and if that does not work try re-coding the injectors