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Try and get a snap on scanner. I've seen some on e bay, but make sure you get the cartridges for the jeep and jeep trouble shooting....

I'm at a loss, I don't know enough about these computer systems yet. I'm used to setting my own dwell, idle, timing. You say it runs rich at times? Could it also be running very lean at times? Have...

Did you get your overheating problem fixed?

I'm sorry but that's all I got.
In the olden days, thermostats would sometimes get old, wore out and stick open.

It sounds like your Thermostat is getting tired. And it sounds like the rest of your system is working like it should.