Connecting 'vacuum amplifier' causes hesitation off idle

If the emissions controls aren't working, you are likely polluting more than without them. They are almost impossible to maintain and you aren't required to so sh**-can those poor designs. The air pump in my 1982 Dodge Aries seized. As I recall, it had a plastic rotor. A check valve (rubber flapper?) was supposed to protect it from hot exhaust gas. Guess how long that claptrap worked?