I have an 05 that seems to run great until i go 40-mil or pull a load the problem is when i slow down or stop after pulling a load or driving 40 mil the truck will hardly pu it self ...it seems like it is getting under the tubo or loading up a can baby it til it gets going or shut it down ans et for 10 min and it takes right off ... white gray and black smoke and the engin rings and knocks any help it is all stock with 80k mil