I have been having a few codes popping on and off. 1171, 1174.. The codes cleared themselves after I replaced the top of the airbox, cleaned the throttle body, and checked all the vacuum lines. A few days have passed and now I am getting, 1171, 1174, 0171, and 0174. I have been checking live data an my MAF is running within the range it says. What else should I be looking at?

 

I just had the 1171, 1174 codes after replacing my wires and plugs. Right and left bank running to lean. I broke the connection from the vavle cover breather into the plenum. Replaced connection and codes went away. Sounds like you still have a vacuum leak somewhere.