Thread: Any Newbie to GTP tuning tips, as far as what NOT to do??

well....my 2001 does NOT have that hose you show in the picture?

I tried to attach a copy of tune and scan here, but it says "INVALID FILE", but I do have a copy of each uploaded at HPTuners site:
2001 Grand Prix Supercharged GTP with recurring P0420 and P0171

I cannot find any vacuum leaks, and with MIL/SES light turned off, but still active, as suggested elsewhere on this site, it comes up as 1 I/M monitor INCONCLUSIVE, which will not pass emissions test.

As the scan shows, it is full rich (STFTs), and O2 sensor is less than .100 volt unless I rev it up off idle, then it works fine...

any ideas or help is greatly appreciated...