1988 Pontiac Bonneville after engine warms up to normal operating temp engine wants to stall out when you come to a stop whenit stalls it starts right back up Iam getting a fault code 43?

Code 43 indicates a fault in the ESC (electronic spark control) system. It usually means the knock sensor has failed, or the wiring to the knock sensor is faulty. When this fails it causes the computer to retard the spark timing to protect the engine, resulting in stalling, poor performance and reduced mileage.