I'd also test the TPS and the VSS since they are inputs to the transmission. I'm not sure about this car, but on most the TPS is just a variable resistor and can be easily tested with a multimeter set on ohms and a spare wiring harness piece (with the car off and you moving the throttle manually). The only way that I can think of to test the VSS is if your cruise control works fine than assume it's fine. Based upon your symptoms I would definately check the TPS and not worry so much about the VSS.
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