I have a "1990 Jeep Cherokee, straight 6, auto, 4x4" except for the auto trans part, mine is a 5 speed stick. 4.0 litre inline 6 cylinder engine. I've owned it from new. I have about 170,000 miles on mine.
I don't remember having problems to quite the extent that yours sounds like, but I have had it run rough and stall at idle. You may have dirty injectors. Mine clears up with a dose or two of Lucas Fuel Treatment. I've also used Seafoam, but the Lucas seems to work a little faster for me.
I usually let the gas tank get down to about half, add a full tank treatment and run it to a quarter tank, then fill up. The concentrated initial dose seems to do the trick.
It may work for you, it may not, but it wouldn't cost much to give it a try.
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Today's Featured Article - 12-Volt Conversions for 4-Cylinder Ford 2000 & 4000 Tractors - by Tommy Duvall. After two summers of having to park my old 1964 model 4000 gas 4 cyl. on a hill just in case the 6 volt system, for whatever reason, would not crank her, I decided to try the 12 volt conversion. After some research of convert or not, I decided to go ahead, the main reason being that this tractor was a working tractor, not a show tractor (yet). I did keep everything I replaced for the day I do want to restore her to showroom condition.
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