so my truck was on a 5 hour drive and towards the end of it the heat stopped coming out of the vent. I stopped to check it out- couldnt see much of a difference under the hood so kept going then the heat gauge went up and check engine light so I stopped and waited, got back on the road and almost immediately temp gauge went right back up. stopped, waited and tried to start and truck made bad sounds with some white smoke from back left side. ... ended up getting it towed then took off spark plugs found 2 were broken, there's a lot of wetness and grime underneath. Now, truck will start but ther'es still smoke coming out from back under the hood.