Motor problems??

[03_stroker]

i have a 03 6.0. yesterdayi was driving down the road towing a goose neck trailor with about 6,000 lbs on it. It was running fine then all of the sudden it lost power. started spitting and sputtering and blowin white smoke at idle and i shut it of. Checked everything over and didnt see any problems. Checked my codes and have none. Then tried to start it again and it just makes a clunk and wont do anything?? I have no idea were to even start with trying to find out the problem. Anyone had this problem??

[RodSeymour]

Try disconnecting egr Do while cold Let set serveral hours

[03_stroker]

I tore it aprat and it ended up being a bad o ring on an injector