I recently drove several miles in some very fine, powdery snow and it actually plugged up my air filter bad enough that I couldn't go over 15-20 mph. Truck was blowing black smoke like crazy. I limped it home and thawed it out. Now its fine. My question is why a check engine light or some other warning light never appeared? The restriction guage was completely maxed out and the truck barely ran. I would have surely thought that this would have made some kind of warning light come on. I have suspected for some time that the intake air temp sensor isn't working right. Could that have something to do with this?