1997 Jeep Cherokee

Hello, with the engine cranking, do you have primary voltage to the coil and injectors? The voltage comes from the asd relay. If there is no voltage that doesn't mean the relay is faulty, maybe the computer isn't grounding the relay for some reason. A common reason is a missing cam or crank signal. Are there any trouble-codes? You might try unplugging the 02 sensors, then check for spark?