Did a swap on my 01 z71 need advice

[Ls6z71]

Went from a 5.3 to a 04 ls1/6 used truck intake all truck Accseseries installed headers did the egr delete question is now its running and no it's not tuned yet but it has zero power Idels fine but has zero power trucks a 01 z71 runs like sh*t

[96/chevy/pu]

If you used truck intake, did you also use truck injectors or did you use LS6 injectors, need a tune either way and it should come back to life.