I was thinking alternator too; but here's the thing... Dash lights and headlights are not dimming any at all that I can tell which is usually an indicator of a bad alt. That was actually my first guess but the car will crank and run. Two, that wouldn't just KILL the engine at speed either. Welll... Would it?

And yes, to the other point, "D4" flashing usually is a sign of tranny problems. The thing of it is is that my tranny seems to be fine for the most part and it hasn't flashed again either. I also read in the official Honda service manual that the D4 flashing can be triggered due to a PGM-FI issue which lead me to my most recent theory of the fuel pump being bad.....