I just bought this truck and once in a while I get the strong of fuel or exhaust smell in the cab. Summer or winter with either ac or heat on. If I put it in recirculate I'm able to deal with it but sometimes the windows fog so cant keep doing this. I've been looking online and it seems this is a problem. Truck is bone stock with 120,000 if I would have known this was a problem I would have reconsidered buying it. I've checked the down pipe and the 9th injector and dont see anything. Ant ideas would be greatly appreciated it's hard to use the truck if it makes you sick driving it.