Originally posted by Zalfrin: I wouldn't continue driving it until you get this figured out, p0300 only pops if you get a ton of activity on your knock sensors.
I know shops don't want to work on a modded car, but it seems like you would be able to find one that would just do a fuel pressure test for you so you can make sure you're attacking the right system. Not like you're asking them to do debug work, just a test.
I thought you were going to keep your opinions to yourself? LOL j/p.
Tim, I think you are on the right track with it being a fueling issue.