Older transmissions had a cable that would stick sometimes. I checked rockauto. Com and they show a "modulator" for your vehicle. I don't know where it lives but given the o-ring in the photo and the fact it measures engine vacuum, I suspect you'll find it somewhere on the intake manifold.
There could be a problem with this unit but first check for a vacuum leak. That would cause the same low vacuum as when you're accelerating. The Transmission Computer will interpret low vacuum as heavy acceleration and increase the shift speeds and harshness.
Saturday, August 6th, 2011 AT 7:57 AM