So, when first starting my 300td in the morning (slightly chilly outside sometimes) or when starting it for the first time of the day it idles rough until it warms up...which by then runs smooth and fine. Although occasionally after the car has warmed up it will run rough and feel like it wants to die when i am at a stoplight etc...so i have to give it some throttle to keep it happy and smooth. Could the idle be too low? wouyld it be my glow plugs? lift pump? Thank you in advance to all!!!