Cant see where you are located, but if its real cold that could be part of it. A truck I used to have was carburated and when it was cold it would stall if I didnt let it fully warm up at idle (exhaust had to stop looking white) and wouldnt restart if it stalled. When stalled I had to let it sit for an hour or 2 before it would restart and it would rough idle and run like shit till warm.
Maybe low compression?