Thanks, gentelmen!
No symtoms at all.
I changed the fuel filter last summer, as well as trated the fuel system with seafoam.
I am also getting codes:
P0137 02 sensor circuit low voltage (bank 1 Sensor 2)
&
P0157 02 sensor circuit low voltage (bank 2 sensor 2)
I am guessing I need to replace the post cat 02 sensors?

I have cleared the codes, and they come back pretty quick.
I will clean the MAF and see what happens with the P1171 code.
Best,