Hello,
Direct Trouble Code (DTC) P0300 is the DTC for a random misfire with your engine. The fact that you are having an exhaust backfire would lead towards an ignition issue, as it suggests that not of the air:fuel mixture is getting burnt in your engine's combustion chambers. There could be numerous reasons why this DTC is rearing it's ugly head, so in the diagrams down below I have included the vehicle manufacturers diagnostic troubleshooting guide for DTC P0300. You will need a code reader with the availability to get and read freeze frame data as well as PIDS though. Please go through this guide and get back to us with what you find out.
Thanks,
Alex
2CarPros
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Tuesday, September 24th, 2019 AT 5:39 PM