You should drive the car noramlly to seat the rings.
Bad cam timing could definitely cause misfire. Check and recheck and make sure that it's correct. Set the crank at TDC, the white mark with the line on the block. When the cam gears are at TDC there are very tiny arrows near the outer edge of the gear that should point together...there is also a mark on the timing cover for TDC that the small arrows will line up with.
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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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