Hi, I am having issues with my car again and this time i think i found the problem. It is difficult to start when the engine is cold, greyish / black exhaust fumes and sluggish at times. I blanked the EGR and still I am having problems. I bet its the Injectors as I have spoken to a mechanic about this issue. We dont have good fuel quality. My question is, is it a hard job to replace and since I have the Delphi Pump, what injectors do I need? If possible with their part number. Any help would be appreciated. Its a 2008 407 Coupe 2.0 HDi RHR engine.