nichshnn

I have a 96 with the 5.8 and codes P0171 and P0174. I took the truck to school with me and we did a smoke test. There was smoke coming out of the egr and the throttle body shafts. We replaced the egr. Is there a rebuild kit for the throttle body? And what else could cause these codes? The engine runs great until the cel comes on then there is a reduce in power. Any help will be very much appreciated!