Is this engine coolant on my spark plugs? P0300

JARblue

Don't start throwing parts at it. That's the last thing you want to do with this code - it can be a black hole. First thing to do is troubleshoot and triple check any and all work that was done recently. Or call up Z1 with the "ever since" details lol. Datalogging is not a bad thing to do either. Then you can make smart decisions for the next steps. The law of unintended consequences may come back to haunt you if you just throw random parts at it.

What on earth makes you think it's fuel related? Not that it would help in this scenario, but if you don't already have a fuel pressure gauge, I recommend grabbing one from phunk (CJ Motorsports). The tap is out of stock currently but says it should be available in the next month or two.

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