Engine Stall After Acceleration Pedal Released

Check idle speed control valve circuit. See IDLE SPEED CONTROL (ISC) VALVE CIRCUIT chart in TESTS W/CODES article.
Check EGR system. See CODE 71 in TESTS W/CODES article.
Check airflow meter circuit. See CODE 31 in TESTS W/CODES article.
Check ECU. See SYSTEM/COMP TESTS article.