The smoke only comes out while the cars just starting to get warmed up after driving for like 5-10 mins. I can only see it in my rear view mirror when I am at a stop. After driving for about 10 mins there's no smoke. Also when I get out of the car while it's running, it smells like fuel. Like it's running rich. Really weird. Thoughts? Getting kinda worried it could be a blown head gasket? That's what I've read.