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2nd Gen Ram Tech1994-2001 Rams: This section is for TECHNICAL discussions only, that involve the 1994 through 2001 Rams. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.
I'd guess by what you described in the other thread an exhaust leak.
It could be a plug, but I'd just buy one NGK and pull them all and inspect em. If you have one broken one, replace it, if not return the plug.
Those iridiums are good plugs and will run just as good if not better than the champions. And you don't need a colder plug until you make about 100 HP over stock. Too cold and it'll just foul more quickly.
Has the plenum been repaired?
Check engine light on? If so, what codes?
Have you rerouted your spark plug wires?
If you don't have tools. I recommond getting a small craftsman tool set. Sears will usually have some on sale every now and then. Can get a nice set for under $150