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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.
A clogged cat will really make for "no guts"... if you've had a plenum problem for any length of time, chances are the cat is toast.
And "cat cleaning" is only to remover contaminants... it won't fix a melted core... in fact "cleaning" not done right will cause a meltdown.
Similarly, a bad O2 will also lead to killing the cat.
I think injectors are fairly non-serviceable without some interesting tools.... but, not 100% on that. There are places you can send them out to, to be cleaned, and balanced. That was the route I was considering taking. (as I have a couple extra sets of injectors.....)
no personal experience but some people use a sonic jewelry cleaner to clean them. i don't know if it really works or not but it used to be a popular topic.