hello all, i have an f 250 with the 6.0 05 year model i was on the road when the truck started running a little warmmer than normal but it did not run hot. i did have to add about a gal. of water to get home. next trip in the morn. vehicle started right up but sounded a little funny, drove to work everything went well, afternoon start up went acording to plan until i drove off, a plume of white smoke came rolling out of exhaust and it fell on its face, no p[ower and it wanted to die. When it cleared out it ran ok, but the rest of the ride home it felt like it had a slight miss and would belck heavy black smoke when on the throttle. this truck is all stock no chip work or anything i change the oil & filter every 5,000 mi. and fuel filter 10,000. any ideas would help