I was getting a EGR error 3 code on my Camaro. It was got the EGR valve
that was the problem. There is a hole about the size of a dime inside the
throttle body at the bottom, This hole is the path to the EGR valve. It
get cloged up with dirt/oil and the air flow is restricted causing the
error code for the EGR valve. I have picture to slow what I'm talking
about if you need. Send me an e-mail at firstname.lastname@example.org and I'll
send them to you.