Wow, I guessed right for once. Now if I could just do that for my own cars... Glad I could help and thanks for letting me know.

I agree with MO LS Noobie, all good things to check / try.

Also, does EGR valve get vacuum from a port on the TB? If so, maybe the return spring in the EGR valve is weak, allowing it to open too...

Firstly thank you all for all the work and for sharing what you've learned. Thank you to the Internet, gearhead-efi.com admins, sponsors, and everyone who contributes running this site. I'm amazed...