Tonight while (lightly) accelerating from a stop sign my CEL came on.
Once home I pulled the codes... there were 4 in total.
P0301, P0302, P0303, and this... ?????
(misfire on cyl 1,2,3, and ?)
Car seemed to run fine both during/after the CEL. I reset the ECU and will monitor it tomorrow. The only thing recently done was a flush of the coolant and oil change (4 days ago).
Tomorrow I'll load up the latest AccessECU maps and reflash the base map and for good measure contact Cobb for what conditions cause the AccessPort to read "?????" for a CEL.