That sparks a memory: I once had a terrible metallic racket that came and went when a screw from the rear main seal housing worked its way loose. It rattled around the tranny bell housing. I thought something horrible had happened, had the car towed to a mechanic (many years ago) and they couldn't find anything or even reproduce the noise. When I drove off, it came back, so back the car went. This time the guy pulled the inspection screen on the bell housing, and out fell the chewed up screw.
I don't know why it would occur only under acceleration, but its a thought.
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