I recently bought a suburban 2006 5.3 It keeps throwing codes P0172 and P0175 tell him it's running rich I have another one same year I switched the mass air flow sensor And I bought a new Map Sensor codes still there When I originally got the vehicle the throttle body was filthy dirty I cleaned it with carburetor cleaner Not throttle body cleaner could this have caused a problem

 

You need a great scan tool to read what the MAF and MAP and other sensors are reporting to the PCM. Without a good scan tool, it's all just a guess. Sometimes you get lucky swapping parts.
You need to see what the PCM (engine computer) is seeing to narrow down if it's a sensor or possibly a leaking injector. That's how shops diagnose these computers on tires. Without a great scan tool your just throwing darts.