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Alot of things could cause this. In regards to things to check, over around the power brake booster there are lots of vac connections, and the rubber "tees" are known to get soft with time, so if the plastic lines seem loose in the tee's, the tee's are available as seperate items, so there's one thing to check (should be 2 or 3 different ones around there).
On the hard plastic booster line itself (from the vacuum pump on the front of the engine to the brake booster), that line can get crudded up and block vacuum to the 2 different ports on the booster line, and that can cause hard shifts also. The booster line is around $40 and easily replaced. On the 2 ports on the booster line, sometimes one of the port "nipples" gets broken off, and the vacuum lines are kind of cobbled back together, this is common and leads to shift complaints also. The vacuum modulator on the transmission could be leaking vacuum also, but usually it's one of these other problems that is the culprit.
Gilly
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