2002 GMC Truck

Engine Performance problem
2002 GMC Truck V8 Two Wheel Drive Automatic

hello there, I can't find my egr valve I took my truck to local auto parts store he said it was on the front of motor I said ok could he plz show me, went out looked and not there he scratched his head just like i've been doing, by time I left had 3 different guys looking they could not help me we looked in auto manual at pic of egr valve on front of motor but it not there. I have been all over this motor top and bottom from side to side. I dont think the egr is all of my problems with my truck but not being able to find this valve is kicking my tail. Could somebody plz share your knowledge with me. 2002 gmc truck SL 4.8 liter 2wl drive