I let my car sit up without running usually for 3-4 weeks at a time. I've never had any problems with it. Never had a drained battery or anything like that, but this morning I took it out. I let it run for about 5 minutes then went down the road. When I got to the end of road, about to get onto the highway, I see a cloud of thick white smoke. What is this from? Is that normal? After I started down the highway it never happened again though. And it's not cold here so I know it's not that.