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Mark,
I'm not sure what you mean by upper engine harness but I had my harness replaced (the one that connects to the blue and black temp sensors) and my car's (93 500E, 40K mi) been trouble free since. It was exhibiting the same symptoms as yours and was even sputtering in some cases, exhibiting a sort of overheat situation which was always fixed by unplugging the wire to the blue temp sensor (which then left the aux fax working always).
Sure hope your car's starmarked!
Cheers!
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