Hi guys, I'm new here and I'm having same problem.
I bought the 2010 370z roadster last year, very low mileage with only 25,000 km (not miles).
It has same mod as well. Stillen cold air intake and exhaust system (love the sound).
I drove it for about 4k then I get the P0300 code one day randomly. I reset it and didn't get it for a week then it pops back. I talked to a mechanic and he said the same thing that it could be many reasons and I might want to start with the small ones first. He said it might be "bad" gas so I drive until the gas as low as it could then I fill up with a different station and reset the code. It went a full tank with no lights, so I thought I have figured it out. I refilled same station and a few days later same problem. I cleaned the TB and MAF but same thing after a week.
I saw somewhere that it could be vacuum leak and I tested that as well with no issues.
Someone in this thread mentioned it could be vibration. This could be the issue too, when idling I do noticed sometime the engine make a slight vibration that does feel like a misfire because when it does that vibration i noticed a little twitch in the RPM.
Any ideas guys? I am about to order spark plugs to change.
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