wht would cause it to not start if it crank nd hit nd is getin fuel nd has spark

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put new timing belt on it cause it was broke when got the car. i also put new plugs,plug wires,and fuel filter on it.i put it in time by the marks as per instructions n book.it cranks,and i hits but wont run it back fires through the motor.i also changed the fuel pressure regulator.i check the compression on each cylinder,crank for bout 30 sec they all have right at 150 for compression any ideas as to what is wrong/