CM2250 stalling at idle

[zyNoT]

I have a CM2250 and it stalls after driving for awhile and parking on the side of the highway. Once parked it will take about 30 seconds to a minute and it will stall like you just turned the key off. I've looked for any visible leaks and none found. When it stalls out I get a code for low fuel rail pressure, it doesn't always code out though. While driving and monitoring rail pressure it seems to keep up while driving without any issue. It does drop when coming to a stop randomly, it doesn't happen every time either, it's completely random but only happens when stopped/coming to a stop and idling.

Gear pump is new within the last 8 months. Engine was rebuilt a few weeks ago and the problem happened before the engine rebuild. Anyone else have this weird issue? I feel like tracking it down is going to be one of those pull out your hair moments...