You may want to check/test your fuel pump relay. It sits right next to the OVP and controls power to the fuel pump, including pre-start energizing, idle and max rpm cut-out. While I don't want to encourage you to throw parts at a problem, I will say that my car had similar issues for a year or so, and since the relay was replaced I haven't seen them come back. I suspect time and/or poor solder connections caused intermittant open circuits in mine, though I didn't get a chance to look at it before I tossed the old part.

-anthony