Injector, or a bad cylinder (do a compression test)
Put a multimeter with the positive end in your antifreeze and ground the negative end. Start your car and see if it starts to read any volts. If it reads any volts you might need to flush your antifreeze. If there is crud building up in your antifreeze in can cause static electricity to start to charge up and then short out a spark plug wire. This might be causing your problem. If your temp gauge jumps as well when it misfires please contact me
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