My 1994 Galloper II runs very rough on a cold start below 0 celsius ( 32 F ). After the engine warms up it is okay to drive but before it is warm it will stall and is very hard to start. It has a 2liter diesel turbo charged and aftercooled engine. I have replaced the injectors and had the front seal of the injection pump replaced. I still have the same problem. Any ideas about how to cure this problem will be greatly appreciated.