71 Chevelle
 

Why when accelerating hard then suddenly letting off the gas, would my 350/4b 5.7l die? For awhile I had a lot of sputtering when accelerating and couldn't go over 20mph. Changed out the accelerator pump and all good--until i take my foot off the gas. Vacuum advance, maybe?

thank you

Is the float sticking.

Seems like if the float were the issue the car would not accelerate properly in gear, neutral, and park. I suppose it could be suspect. Just seems odd that it would only come into play when decelerating suddenly from a hard acceleration while in gear. thank you