Chris;

1. Check for a vacuum leak in that path! I guess there isn't there any sort of fine flow adjustment to the Cold-Start valve Throttle bypass path...when it's cold and open, bypass air, and resulting idle is what you get...I suppose you could add some flow limiting if it's really high, or just partially block hose, but it does sound to me like a possible vac leak...

2. Yes there is a check-Valve in the FuPu and Regulator output is supposed to hold Pressure, but not for days...that 2 second prestart precharge running of the FuPu should be enough time to bring Fuelrail up to operating pressure, if not, perhaps you have a flow restriction or other issue...check you Fuelrail pressure!

Good Hunting!