Datbuns

So this has been just recently happening after messing with my fast idle cam, whenever I drive and I'm barely on the throttle, my truck (82 Datsun 720) seems to sputter and jolt as if something's not getting enough fuel. Another problem I need help with is whenever I go from slightly high revs and shift into neutral my truck stalls out, even when it's fully warmed up! After going over my engine multiple times, there seems to be no vacuum leaks, or anything out of the ordinary. Help would be greatly appreciated as I am fully out of ideas to fix these very annoying problems. Thanks!