2 gen cummins cold start issues
 

It will start and run at higher rpms when cold, will not idle also smokes alot of white smoke

what injector and what is your timing set to?

I've been suffering a similar problem. I lived in Fairbanks AK for 22 years and of that I've had my truck for about 14 years. Sure, plugged it in when it was cold and I never had a problem. The gas stations would switch from summer fuel (#2) to winter fuel (#1) and there was never a problem even down to 50 below. I moved to MI and my truck was acting up on cold mornings and it would start at 28 above. I started using additives and it helped a bit but I'm convinced my problem is with the quality of the fuel. I filled up at a different station and the problem got 75% better instantly. I don't think MI switches fuels when winter is coming and my hard starting problem is 100% temperature related. My truck would fire up at 0 in Fairbanks but here it's going to struggle at 20 above. It's the fuel.