VSS stands for Vehicle Speed Sensor. A faulty one might confuse the hell out the ECM. Just for curiousity sake test the Throttle Position Sensor. Look for the change in resistance to be smooth and not jump around when opening and closing of the throttle. While your there check the connector at the distrib. Since two of you have discribed the same condition and also have the P0500 DTC, I would do a thorough investgation of the VSS as well as it's harness and connections from the sensor to the ECM.
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