Posted by Bingo on 6/21/2014, 10:50 pm, in reply to "carb."
Probably manifold vacuum. I can not say for sure but from the sound of it , it is probably a choke pull off. The choke starts tight. When the car fires up, the vacuum pulls the choke off a little. Type the car into the puter, I've found a diagram that way. good luck! Californistan