The cause of the P0300 is likely a lean condition and not a rich condition. It’s very common to get this code especially on the Stillen kits. Check your Afr at startup and verify it is within parameters. If it isn’t, ask your tuner to make adjustments. When you do your cold start, the system has to pressurize, it’s normal for the pressure be at zero at startup and build progressively once the car fires. In that moment while the system is pressurizing, if it doesn’t pressurize fast enough the car will have a misfire and the code will be detected. Try this: before you start your engine, with the ignition on, use a third-party tool to run the fuel pump for at least 10 seconds, then start the engine. See if that prevents the P0300 from happening.
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