ok so I’m towing my 5th wheel, everything is fine until I start up a hill, all of a sudden I pick up a noise that sounds like a spark plug has come loose... then I begin to loose power, serious power loss... I made it to the top of the hill and am able to park at a truck stop... I check the plugs and replace all of them... I still have a miss, low power, the noise, and I have some water coming out of the exhaust...

this is a 6.0 gas... I just had the heads redone about 2000 miles ago.. the noise seems to be coming from the top front of the engine....

any ideas what it could be?