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Old October 10th, 2021, 22:18
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8Mud 8Mud is offline
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Join Date: Sep 2003
Location: Central Germany
Posts: 8,738
Re: I going nuts with this issue on my daughters 2000 XJ

Just something I would look at, rear 02 sensor wire cooking on the exhaust, front O2 harness cooking on the header, especially if you have swapped out a water pump or steering pump. Sounds like as soon as the motor switches over from open loop to closed loop the fuel trim turns to crap. Might also want to take a look at the O2 sensor heater fuse.
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