ECU? Distributor? Ignition coil? Try cranking the car for 15-20 seconds and see if the CEL comes on. When the car won't start you have to crank it for a long time to get the CEL to come on.
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2015 Ford Mustang GT Fastback - Ingot Silver - 6M - Performance Package - Gibson Catback, JLT CAI, FR 47lb injectors, BAMA E85 tune, Eibach Sportline, BMR wheel hop kit, UPR oil separator, Steeda shifter bushing/bracket
Team B.O.B.® - Ballaz on a Budget