any of you fellas had the following problem? The problem only occurs in sub zero temps and its when the car is started in the morning or from a long period of inactivity. The car will crank and catch first time no problem but then for a couple of minutes the car runs really rough and struggles to get up to idle speed but then it's fine. Just wanna get to the bottom of it before the really cold weather starts. I've had the glow plugs changed so far but no use.