check engine light flashing on 1996 Chevrolet Cavalier

It seems as if my car is running on 3 cylinders. The check engine light keeps flashing at me. I have changed the spark plugs and plug wires in vehicle already. Does anyone have any suggestions on what could be the cause of the issue?

Asked by for the 1996 Chevrolet Cavalier
plugs, boots, coils and cap carrier are usually replaced all together. common failure.