1995 Volkswagen Jetta Help

I can't seem to narrow down my engine problem. My check engine is not on. My car is using alot of gas. When you 1st start it after it sits for awhile, it has a cloud of white smoke that comes out the exhaust and it is starting to miss when idling sitting still. When you first start it up for the day, along with the cloud of smoke, the engine doesn't want to run. It cuts out and spudders for awhile until it warms up