Did you have the electrode of the plug grounded on the valve cover to check spark?
Is the CEL on? If the car won't start, you have to crank for 15-20 seconds to get the CEL to come on, so try that.
Was the car driving wierd before this, or did it just not start one day?
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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
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