Isphius........
It appears you need an 02 sensors to bring down the CO% and the HCs.
What kind of test is it? Dyno? idle? 2500rpm?
Apply a vacuum (mouth suction is enough) to the EGR valve at idle and if the engine coughs and sputters, then the EGR valve and passages are ok.
But the modulator or hoses may be a problem.
If no change in the engine is seen, and the valve diaphram holds vacuum, then the passaged are plugged.
N/A 7mge, Start with the cover (4 bolts) on the top of the intake runner.
http://www.cygnusx1.net/supra/librar.../em/EM_20.html
its far left in photo, middle.
with a new valve job, tuneup, cat conv, 02 sensor, and clean EGR system.
My #s here in Calif with Dyno test:
15mph
HC. max=106...me=70
CO%. max=0.70...me=0.14
NOx. max=762...me=482
25mph
HC. max=81...me=30
CO%. max=0.57...me=0.00
NOx. max=701...me=152