[Hachi-boi]

well I have 4ac running a 32/36, and it was running good for a long time, then recently I cant get her to go past 3500 rpm she just starts to missing or something!? she just wont go past 3500 plz help I checked vacuum hoses but just to be sure which line is the advance on the 4ac? I was told its the one on the bottom of the dizzy