I have a bad case of "crank no start" on my 1998 jeep wrangler tj 2.5L and have managed to trace it back to my fuel injectors. When I turn the key to the ON position, they receive a short impulse as they should, but they don't receive any impulse when cranking. What could be the cause of this? Is there a communication error between the PCM and the injectors or is it a problem with the wiring? It seems weird that they manage to receive the impulse when turning the ignition on but fail to receive anything when cranking.