Maybe the car needs some other basic tuning like timing adjustments. What is your intial and total timing at? Also is the vacuum line connected to the right port and are they free of cracks? Also the vacuum chambers have small ports where a gasket is used to seal, maybe they are loose or missing, try tightening them.You should look at the diaphragms, maybe they are old or torn. You should definately feel them kick in when you get on it.