No fuel injector Pulse when engine primes

The vehicle listed above is a V1500 with a 5, 7L V8, TBI. The fuel injectors won't pulse when the fuel pump primes. No matter how long I crank the engine the injectors will not pulse. However, when I spray starter fluid down the throttle body when cranking, the engine fires right up. After which the fuel injectors will start to pulse. But, after starting up the engine will go into a high idle of 1,800 RPMs in most cases. Following that the engine will gradually pick a lower idle until it eventually stalls. I have replaced the ECM multiple times, including the ICM, coil, fuel injectors, fuel pump, and fuel pump relay. I do have an OBD check engine code come up randomly, Code: 42- Oxygen sensor error (rich condition indicated). Could the possible issue be with the electronic spark control module?