I have a 2011 RRSC with 93k miles and have a few issues I am trying to sort out. First When the engine is cold and i fire up it runs a bit rough and gives a restricted performance light for about 30 seconds. I can shut it off and restart and it runs well with no other issues. I get misfire codes for cyl 2,4,6,8 and P0316 for randoms in first 1k revolutions. I have tried swapping MAF's around and no difference. all the codes are for bank 2. the actual counts are extremely low as well with cylinder 4 being the highest i've seen on between 15 and 20 misfire. the others are single digit if anything. I dont want to just start guessing and dumping $$ on parts that don't need replacement. Anyone have ideas?