EGR Valve 83 500 SEC

[CamelotShadow]

Decade history of borderline pass fail
Car sat with old owner & gets little use by me.

Tweaked by smog this time. Tech suggested EGR valve

So can I clean mine?
Check its vacumn hose lines
Anything I can do
Scrounge the junkyard for a low mileage EGR.

I want to do what I can as it was suggested the EGR valve costs $500?

Help