I have a 2004 6.0 diesel and there is a plug loc. 4-5'' above where transmission mounts. This bolt has a o-ring and it keeps blowing the o-ring. It never had done it until 4 months ago and it has recently happen. What is that bolt for? And is there a special o-ring I need to buy?

My ford f 250 6.0 l the engine shut down when is idle and hot .
J just turn the stering and the engine shut down too.
And when
J start air climate at idle the engine come off.

What's the probleme