which programmer tuner is best

Hi to all of u im alex im new to this chevy forum im 24 and from miami and i own a 1997 chevy 1500 5.7 350... i really need help to see which programmer is best for these trucks. i have intake, and full complete exhaust long tube headers and no cats. i have an engine light after i put the headers and is shows the EGR so my question is which performance programmer tuner will take this code away and improve hp and evrything else on this truck, if anyone has any ideas please feel free to help.