Engine code help!!!!!!
It doesn't necessarily mean that you're getting a misfire, is what I'm saying.
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Unfortunately, it can be caused by many things...bad plugs, bad wires, bad coil, bad opti, bad ICM. I would check your ignition system in the order I listed.
Whan I got a P0300, my opti failed a couple weeks later, rotor detached. Just throwing that out there.



