[shorod]

It sounds like you may have a problem with the Brake Shift Interlock (BSI) solenoid. This would be an item you could replace yourself if you are pretty handy with hand tools and are not afraid to dig in to the car.

The manual I have for the 1993 SHO with 3.2L (ATX) implies that the BSI solenoid is located at the base of the steering column. It appears that there is a cable that goes from the BSI solenoid to the shift lever in the center console.

-Rod