the coyote continues to bite... resolved! :)

[John Ibele]

Bummer, Todd. I was also hoping to see something that would suggest low fuel pressure being the source of the problem. Such a cause could have also been consistent with the temperature dependence (runs for a short bit on cold start). Vapor pressure of the gas would increase with temperature; gasoline starts moving from liquid to vapor phase at about 95F. So if you were suffering from low pressure at some spot in the system, the fuel wouldn't necessarily vaporize immediately, but could at mildly increased temperatures. I would think that would also be consistent with a lean condition interpretation by the ECU.

I don't see how any of this could be consistent with the free-flowing fuel rail you just demonstrated, and I don't know your engine well enough to comment further. Maybe it will trigger something in the minds of those familiar with your engine. Good luck.