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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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