I had an unintended acceleration event in one of my Subarus a few years ago, and that car has a cable throttle. Turned out to be a groundhog trapped under the hood; poor fella must have been hopping around like crazy under there, occasionally tramping on the accelerator for me.
I found this interesting in the NPR article:
"CTS, which relies on Toyota for 3 percent of its annual sales, supplies similar parts for Honda Motor Co., Nissan Motor Co. and Mitsubishi Motors Corp."
I think that pretty much rules out a pure mechanical fault.
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