Any chance you reconnected the linkage wrong? Or didn't reconnect all of it? That'd be my first guess since the shutoff lever stopped it. Also, since it didn't accellerate until it exploded, it was probably being saved by the govenor in the IP, which futher suggests it wasn't a true runaway. Scarry just the same through.
You might have a vacuum leak too, but that wouldn't cause it to rev. Not shut off yes, rev no. Unless the cruise control got in on the fun somehow (don't some of them use vacuum to help push the linkage around?).
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