Like mentioned above, the stocks are good enough. If yours need replacement I would replace them w/ the stock 2002 inj. My 99 silvy came w/ the 19lbers as I believe yours did as well. I replaced mine w/ the 2002 24lbers. As mentioned, bigger doesn't necessarily mean better but 19lbs seemed to small for full bolt-ons.

 

if you happen to need some replacements i have a couple of stock sets lying around.

 

i think i have 3 or 4 sets of stock injectors also..

 

Not sure if the 00's had the 21lb or 24lb injectors, but I think only the 99's had the smaller ones. Hopefully someone who knows for sure can chime in. If by chance you do have the smaller ones and go with something bigger, remember that the PCM will need to be tuned for the larger injectors or you will run pig rich as the injector duty cycle doesn't need to be as high with the larger injectors.