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.
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Saturday, August 6th, 2011 AT 7:57 AM