02-09 Vortec 4.2L I-6 Engine and Drivetrain
Hi,
My issue with the P0171 started awhile ago and I'm still chasing it and got no progress I'm no mechanic and I really need to fix this since on mechanic in my country was able to fix it (I'm not from the USA) so here's what I did so far:
-Checked for vacuum leaks with a smoke machine and...