97 chevy Suburban code PO172, PO175

Engine light comes on and after sometime goes off.
Chip came up with these codes PO172 , PO175
Please could some one help what to do next
Thanks

p0172 and p0175 are bank 1 rich and bank 2 rich. If you have access to a scan tool, I would check the fuel trim and see if engine is running rich all the time. I'm not sure about Chevy, But on Nissan if both banks are too lean or too rich, usually the cause is the Mass Air Flow sensor. If you have a buddy with the same truck you could swap MAF sensors and see if problem goes away on your truck and then comes up on theirs, that way you would know if its bad before you replace it. Other problems could also be fuel pressure regulator, o2 sensors, etc.