Well this is turning into a PITA.

ECT and MAP readings look good. Can't check fuel pressure yet, had to order special tool that goes between the fuel line and the fuel rail...
Doubt its an 02 issue, sensors are functioning properly and no other codes (normally you'll get an 02 sensor circuit fault).

I also doubt its the fuel pressure, but need to check it for peace of mind.

I'll probably replace the t-stat on Friday. Thinking that the t-stat could be getting stuck open on occasion which would make sense, and result in my intermittent condition. Past few times I drove the XK i had my scanner hooked up and was in closed loop within a minute...

Only other thing I could think of is they're running more than 10% ethanol at the gas station i've been going to, and the system is sensitive enough that it effects it. So i'll be keeping my eye out for TSB's since I doubt i'd be the only one that has this issue (note that there was already a software update for flex-fuel vehicles that had this issue)