If it was an older transmission with kickdown cable, I would say the
cable needs to be replaced/tightened. In a tranny that uses vacuum
kickdown, I would guess clogged lines or bad switch. In your car, well,
someone is telling it to shift wrong. If it has a computer, it could
either be the computer or the sensors it needs to know what is going on.
(if you need to email me, use this address =)
Does it stumble? Or just not react? The reason I ask is that if it
stumbles I wonder if this could be some type of EGR issue, but I would have
expected at least a periodic rough idle if that was the case.
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