F'n EGR....but its required.

OK, non Mopar related but perhaps its general knowledge. Should my 82 Mazda EGR valve be the slightest bit open during idle? It idles at ~650, uses ported vacuum for the distributor so its at 8 BTDC with no vacuum on advance pot at idle. Im getting a rough idle and found that the EGR is raising about 2-3mm with barely any vaccum on the EGR valve itself. I pull the EGR line and plug it and the idle clears up considerably. I can barely feel a vacuum on the line. Im thinking the EGR spring is worn/weak or it does have an adjuster on it, a very small nut and a threaded pintle. Are they adjustable? I cleaned it and it seems like its in good shape seal wise, cleaned the carbon off the pintle and seat.