Yep, there is an emissions issue going on somewhere. Thus the $60,000 dollar question is what is setting off the buggar. Bad gas? Cold humid weather would make mine run like crap until she got warmed up. Does the CEL comes on during specific times of the day or certain driving conditions? If so,try to have a code reading done during this time. If it comes and goes without rhyme or reason it wont hurt to drive her ( according to the Bentley Service Manual). Try some SeaFoam in the tank.
Uhhh...if the universe is still expanding, WTF is it expanding into?