The crankshaft sensor sends a signal to the EZL/Ignition Module. The EZL then sends a signal to the coil to spark to the cap tower then to the rotor. If the sensor is defective, you will never get a spark. If the wires are frayed, you may get an intermittent spark which would cause misfiring, rough idling, and errors when the system is checked.
Hope this helps and keep us informed as to what happens.

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99 C230K Sport
87 300SDL
81 300SD