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It's the fuel pump ECU going out. I can't post a direct link since I'm using my phone to post this. Search for the 12v fuel mod. I'll get you a link once I get home.
I had a problem like that.. occasionally it'll down pretty low around 300s but it would never die on me. So decided to WOT one time and i checked it out again and it hasn't happened since.. but im pretty sure thats not the right idea.