I would look carefully at the camshaft, even though is looking nice, clean with no pitting- using cheap oils will eat the cam lobes where it pushes onto the lifters- you will see they are out of shape . Best to put car in high gear and push it, the engine should turn and reveal the shape of cam lobes...
Injector wiring looms will came up with misfire on that particular cylinder and would not effect the running from cold- bad glow plugs and funked cams will !
Injector wiring looms will came up with misfire on that particular cylinder and would not effect the running from cold- bad glow plugs and funked cams will !