1997 GMC Yukon Engine won't start

The Crank Sensor wires burn when then hit the exhaust manifold and the engine shut off. After me repair the burned wires and try to turn on the engine this never occur. Me check the flow of electricity from the igniton and this not throw any spark, Me verify the continuity of all wires to the ECM and all is Ok. Me replace the Crank Sensor and the Ignition Coil and nothing happen.
Is the Computer damaged?