Hi guys new to posting on forums. I have a 21 Sierra with the 3.0 Duramax in it. Has about 6k miles on it. It has been pretty cold here in Colorado noticed today after sitting for 2 days when I started the truck it started a bit rough and smoked blue/gray for about 5-10 seconds. Has anyone else noticed this? I don’t know if this is the first time but this is the first time I noticed it, any input would be great!