Hi,
I've got an Astra 1.7 dti (16 valve Isuzu y17dt engine) in cold weather the engine stutters quite badly (no problem in starting just Kangaroo juice) as I say only in cold weather anything below 10 degrees C during the summer it's fine first noticed the problem last year and thought it had been sorted during the summer only to return with the cold weather. I've checked fuel filter and injectors have been tested there are no air leaks in the fuel system any sensible sugestions greatfully accepted.