2003 GMC Sonoma P1072 / P1075 codes

[uconn4444]

My father-in-law’s 2003 Sonoma truck has the check engine light on and I found it was driven by the P1072 / P1075 codes, indicating that both bank 1 and 2 were too rich.
We have tried numerous repairs to fix the issue, including the following:
• Replaced all oxygen sensors
• Replaced a vacuum hose
• Replaced the spark plugs
• Replaced the fuel filter
• Replaced the spider injector assembly
• Cleaned the mass air flow sensor
Despite the above actions, the truck still has the same error codes. He took it to the local Chevy dealer and they could not find what was wrong. His state [New York] has a yearly inspection and the truck will not pass this with an error code, leaving him without a means of transportation – please help!