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Try some engine cleaner and that will help improve rough idle and or performance. To me it sounds like a possible motor mount issue. Sounds like the front engine mount. Because you explained up a hill rattle. / Down Hill\ no rattle. Engine lifts when going up hill and shifts downward while going down hill. hence no vibration because of gravity pull and the weight of the engine.
I would next check the condition of the engine, transmission and transfer case mounts. The mounts all have rubber inserts in them to absorb vibration and if the rubber starts to deteriorate or drycrack it can cause a vibration, especially under load.
You may check the exhaust system, I had this happen with a same year Dakota and it would bog down the more I tried to accellerate. My cat had fallen apart inside and clogged up the pipe.
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