[69308] During the past week, idle has gotten rougher and drivability issues have arisen. I an effort to eliminate the problems, I changed PCV valve, breather filter, air filter [Delco A212CW], the remainder of the vacuum hoses. I also found the carb was a bit loose and probably leaking vacuum, and the EGR valve I though I had disabled by putting a plug in the line, had started working again since the plug was leaking! I just disconnected the line entirely but the were still issues. So I pulled the EGR valve and fabbed a new gasket with paper and Hi-Temp RTV, and now it looks like the issues are gone! Celebrated by driving her over to Cooper's and getting a hood bumper for the left corner.