If you put vacuum on it off the car and it worked either the tube is clogged and no vacuum is getting to it or the seal there is bad. If the old egr was crack maybe the fitting it was on has a crack also?
Thanks Macdorne. The old EGR was rusted and when reved at 3000 rpm, it would bend at the tropod ( mounting in the valve where the diaphram is) as
one side was cracked. With vaccum, the valve would pull in and bend.
So, I bought a brand new valve which works great when vaccum is applied manually and idle becomes irregular, which also means the valve is opening.
I have not touched any vaccum lines as the old one was working at 3000 rpm.
Now the new valve does not get vaccum at 3000 rpm thus will not open.