Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP
this may help you
REMOVAL PROCEDURE IMPORTANT: Note the orientation of the EGR valve at the BASE before removing. Do not use the electrical connector as an indication of valve orientation. It is possible to install this EGR valve backwards. An EGR valve installed backwards may cause a rough idle and set DTCs.
if you have the4.3 engine..you shold be able to just take out two bolts and remove it..look at the pictures above