Starting to get P0170 and p0174 codes now. Pulled MAF out (original) and cleaned it yesterday with MAF cleaner, cleared and code came back at lunch today. Idle is great and feels like more power up top but still getting the codes. Light seems to come on after driving for a while and coming to a stop(red light/turn) everything seems tight. There were some gaps around the elbow/MAF connection initially when I put everything together but it does not seem to be leaking anywhere and it's tight after another removal/install. I feel like I can hear a hiss while the car is running but it's all over, I can't really say where it's coming from. I tried to do the incense test but didn't see anything suspicious. With engine cover on if I plug the holes the engine starts to die and it does not seem to be sucking air from elsewhere so not sure what else to try. I ordered another o ring from MB, should be here tomorrow (I used a new one initially) only thing I have not done is taken the TB off to check that the ring is good. Looking at the MAF values in the ultra guage the numbers look like stock at a given TB position.