Hi all suffering cold start up issue. 1.6 multijet and ducato. Finally solved. I have carried out many electrical tests obd diagnostics fuel pipe checking etc. Nothing found. After a conversation with an old guy at the MOT station. Problem solved. The one test to carry out is injector leak off. Or have them overhauled or fit s/e or new. Less messing about because you will find more than one will have excessive leak by and you'll end up needing to replace or repair all 4 anyway. Hope that makes sense and solves your problem.