wow i wish i saw this thread a couple weeks ago. I had the P0171 code for a few days, so I cleaned my MAF and reset the code with my AP. Since then the CEL has stayed off, but I'm still getting the stuttering boost idle issues that Cinnabuns mentioned above. I will be installing a new front O2 sensor as soon as it arrives. In the meantime I guess I'll just keep checking all my hoses and airbox.