egr problem

[frankzlt1]

I just swapped back the original pcm in my car from the obd1 convert I got with my car. Its been 2 years now sence I had the original one so now I have egr code, when I press on the egr diaphragm the car will stall. Was wondering what could be the prob with it, I know of it possibly be clogged, or vacuum not opening it. I think the best thing to do is get it tuned out and block it off.