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The cats are clean. Did not replace O2 sensors

Any help please with poor acceleration and power.
new plugs, wires ,knock sensors, intake gaskets, New IAT, temp sensor

Thank you

Hi All
I'm Larry I'm a Network Administrator for the State of Tn.
I own a 2004 GTO 5.7 LS1 And I'm clueless about tuning.
Had a friend tune it for me and for the firm shifting (could be better). ...