My 71 350 monte takes awhile to warm up. She runs a little rough until she warms and then is OK. I have a question regarding the air cleaner hardware. There is a round AC plastic cover over a metal disk in with the air cleaner. It has two vacuum hoses going to it. What is it? I put a vacuum gauge on it and it does not hold vacuum. Should it? I put the vacuum guage on the nozzel of the air cleaner hardware and it opens the valve within the nozzel. How do I check the round AC (AC is stamped on the top of this plastic piece) and what is it for? I'd take a picture but I still need to master the posting of pictures. (old guy) Thanks.
Tom