I was getting a P0171 code, replaced the MAF and now getting the P0172 code?

Question

I have a 2002 Chevy Silverado with the 5.3L V8. I was getting the P0171 & P0174 codes, I replaced the MAF and now I received the P0172 & P0175 codes, what could be causing this?

Answer 1

there is a service bulletin for the fuel injectors getting clogged

https://www.autocodes.com/uploads/gmc/03-06-04-030F.pdf

 

you should use 91 octane fuel from Shell with a good fuel system cleaner and see if it helps