1997 Ford Explorer dies in drive

Check for codes
check fuses
check speed sensor
check instrument cluster
check under hood for any loose wiring

Check it for codes
most parts store and local repair shop will do it for free where they hook it up to a small tool that will access the computer and read out the codes
lets us know if you have
locate at the rear differential on top a sensor check it
disconnect the sensor and give it a try
open the hood and check it the move when you but it in drive causing the wiring harness to move in a way that cause the stalling
check for vacuum leaks

really nothing else to explain, you have to check and let me know your findings
good luck