Check out my recent thread:

http://www.peachparts.com/shopforum/showthread.php?t=213239&highlight=glenmore

I went to this shop in your neighborhood.

All-Car Specialists Inc 330 S Del Mar Ave San Gabriel, CA 91776-1349 (626) 285-2205

Cleaning the EGR tube was not that expensive. FWIW, when I asked him how he did it, he said he went thru the throttle body.

glenmore
1991 300CE
2000 C280
1990 LS400