Plymouth Voyager 1987 2.2 carb.

Checked EGR and is working fine got the idling engine to shake more when I applied vacuum to EGR valve,
the thermal valve is working as well, just tested. Did the combustion chambers cleaning after the e-test.

Background:
When van is on 2,000rpm test, NOX was failed along with CO. Both are not too far, like 100 points above limits.

I had the timing gun on it when I was testing the EGR vacuum, I get some vacuum at 2,000 rpm but get more stronger if I go above 2,200-2,500rpm.

If yoiu have info on EGR vacuum strength in Hg at 2,000 RPM on a carbed 2.2, please let me know, this is IMPORTANT.

Thanks & Cheers, Wizard