Car runs fine after reving it up. 1967 chevy caprice
I have a 1967 Chevrolet Caprice and when I start my car I usually have to pump it to get it starter, after I get it started and I take off, the car seems to spit through the carburetor. I will put it in neutral or park and press the gas really slow until I can put it to the floor and I can hear the secondary open up. After that it seems to accelerate just fine. But when I kill it I have to do it all over again. How can I get it fixed to where it runs and accelerates fine when I first start it up?