Ford Bronco P0120 Code: Stalls at 1.5 Grand, Idle Issues After Feathering

My 1996 Ford Bronco 5.0L engine starts and runs smoothly until it reaches approximately 1.5 grand miles, after which it stalls. If I release the throttle pedal immediately, the vehicle idles briefly but stalls if I hold the pedal. Restarting resolves the issue, and when I gently feather the throttle (light pressure), it runs fine until I stop feathering—then it stalls again. The Throttle Position Sensor (TPS) readings appear normal, so I replaced it as a precaution. Despite this, the problem persists. Any insights or solutions for P0120 code on a 1996 Ford Bronco would be greatly appreciated.