I found the thread below to be helpfull:
https://forum.ih8mud.com/80-series-tech/354347-p0171-landtanks-maf-2.html
I had the P0171 code come up right after I orderd Landtanks MAF so I knew it wasn't that
But after reading the thread it helped. Good Luck!
https://forum.ih8mud.com/80-series-tech/354347-p0171-landtanks-maf-2.html
Finally he takes off the air filter canister cover and removes the air duct. Everything is cool. No issues. He does notice that there is what looks like a very thin coating of black soot on the throttle body so he cleans that out. Then he takes a look at the sensor of the MAF. Its coated with the same black soot. He sprays it down and re-installs everything, does nothing else. CEL is gone.
I had the P0171 code come up right after I orderd Landtanks MAF so I knew it wasn't that
