I would try cleaning the mass air flow sensor, since the lean condition is not a p0171 or p0174 code. The other codes are shadow codes, which isn't codes that will set off the SES light.

Other source of problem for the 227 and 228 could be a low pressure/volume fuel pump. You can connect a pressure gauge at the fuel rail and determine what the pressures are with the Key in the on position (primeing the system) and with the engine running. At idle you should see around 50 psi or 344 kPa.

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