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I had the same exact problem on my 98 model and it ended up being the very first o2 sensor right out of the exhaust manifold I don't knw if yours has that but if it does unplug it while it is running bad n it will clear up or stay the same if it clears up that is ur problem. Hope this helps

Need help. Sorry

First time to post great forum. I have a 98 xj that has a 4.0 in it. When I crank it it idles a little high and then when I starts to warm for a few mins. It will start surging and doing alot of rough idle. I have changed the map sensor and the plugs in it still didn't help. If ne body has ne...