Ya but he said his tuner said the afr was around 12. That's kinda lean if that's true. With the xp it almost sounds like he can't get enough fuel at 125 inj duty.
You want around 11.5 afr for non intercooled and 12 for intercooled. In this case he's lean
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2004 Grand Prix GTP |FWI | HP Tuner | 1.9 Rockers | SD Headers | 3.5MPS | 97-03 control arms w/GMPP sway bar| Planned soon: s3x, custom ported heads, IC