My son owns a 1999 Malibu. The car is stuck in park. on 1999 Chevrolet Malibu

Can you tell me if its the pressure switch or something else

Check to see if the brake lights still work, if not check the stoplight fuse. If they do still work, you most likely have a shifter interlock problem that will need to be looked at by a mechanic!
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1 more answer , 2 more comments
Stuck in park? Do you mean the shifter is stuck? or does shifter move and car doesn't?
The shifter will not release to another gear The car idles but won't shift out of park
The brake pedal activates the stop light switch; In doing so it also sends a signal to the actuator to release the shifter. Would have to check the brake switch and/or the actuator. Try to turn the key 1 click, not to run (when the dash lights come on), And see if it will shift out of park to neutral. If it does start the car then into gear. Needs to be checked to see which one is the problem. Floor or column shift? WHAT HAPPENED WITH YOUR SON'S CAR?