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Turn the key to the run position and look for the Check Engine Light to come on. Also get a scanner on it and see if there is RPM on DATA while cranking. The Check Engine Light should also go out while cranking. if the light stays on or there is no rpm on DATA, go to the crank sensor and check for AC output while cranking. It should read about 1.0v or more. Replace the crank sensor as needed.
Crank Sensor output is tied to cranking speed. Make sure that the battery is fully charged before testing crank sensor output. Ford spec is 0.50v or more, normal is 1.0v AC or more with a good battery.