Intermittent Engine Misfire with codes P0300 P0303 P0305

Averying

I’ve had some strange intermittent issues like this on my g35 and it turned out to be bad coil packs. Sometimes they’d be fine, sometimes the car would misfire terribly. Since the car sat for a while, you could have gunked up injectors.

As a cheap first check, I’d throw in some new spark plugs and a bottle of redline fuel system cleaner in the tank with high quality 93 octane fuel. Redline is one of the best types that ‘might’ actually do something unlike most of the snake oil products out there.

If the issue persists, you may have to start replacing coil packs, but they’re only $50 on rock auto. Not terribly expensive…


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