00 XJ running terribly with lots of codes.

I will try that but as I mentioned, I flashed the pcm with the superchips programmer quite a long time ago. It's been happy for over a year and superchips is a reputable company. I will take what you guys suggest into consideration and when I get a chance to work on her again I will uninstall the program.
 
Okay, guys. The jeep has been sitting since my last post with the battery disconnected. I hooked it up yesterday and started her. Voila! She runs like a top without a hitch. I drove around for an hour and I am now thoroughly convinced that I should have named her "Christine" instead of Sheila. I have no explanation other than perhaps I now have an intermittent fault. I'll keep you updated with any problems that I encounter but so far she's perfect. Thank you all for your suggestions and help along the way.
 
Sounds like being unplugged drained all the power from the conputer and the PCM reset to defaults.
 
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