Check those fuses on the battery for signs of overheating. Swapping won't prove one way or another, but just pulling out and putting back in may temporarily clean up a poor connection. If you look at that link I sent in my last response, you'll see how this can occur and wipe the codes clean.
If you're certain the trouble isn't electrical, I'd suggest revisiting the fuel pressure regulator based on your response about moisture in the vacuum line -- your description doesn't mollify me any more than it did Greg.
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Art Benstein near Baltimore
Dijon vu: the same mustard as before.
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