Just an up-date. It did happen again and she was able to limp into a service shop. Turns out that a mouse had found its way under the plastic engine cover and chewed into the engine temp sensor wiring insulation. When the exposed wires would touch and short out it would send the message to the computer that it was running hot setting it into limp home mode.
New wiring and good to go.
I also found evidence of mice under the same cover on my 2000 Bonneville.
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1969 Firebird 350 convertible, t-5, Carousel Red
2008 Solstice GXP 5speed manual, Sly
2008 Grand Prix, Ink Slate, Winter daily driver
2009 G8, Switchblade Silver, summer daily driver
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