Check the harness for the injector for loose connections. Also, if you purchase a noid light(Oreily's carries them) to plug into the #5 fuel injector harness and turn on the car to see if it's telling the injector to fire. If the pulsing of the light is intermittent and not steady then there may be an issue with the computer. If the light is not coming on at all then there may be a break in the wire or like i said a bad computer.
Random/Multiple Cylinder Misfire Detected have a good day !!
P0300?? Multiple Cylinder Misfire
P0301?? Cylinder #1 Misfire
P0307?? Cylinder #7 Misfire
are the codes start with the basics inspect plugs wires cap rotor and if all checks out do a compression test
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