1964 Impala stalling issue
Hello everyone new guy here and needs some help. I have a 1964 Impala SS with a 283 2bbl rochester, and 2 speed powerglide. The car started giving me issues where it would stall out when I hit the gas pedal. I automatically suspected the accelerator pump on the carb, but was not sure. Here is a list of what has been done so far. I found a leak from the gaskets on the manifold so I replaced those, carb has been completed remanned, new fuel filter, new plugs, wires, distributor, cap, and timing has been reset. I took the car to a shop after replacing everything because i was at a loss and limited on tools. They noticed when the carb was remanned that the springs behind the air and fule screws were not replaced and the carb could not be adjuted properly. The carb was gone through one more time and the springs were replaced. After that they went through timing again, adjusted the carb, and it was running great. I went and picked it up and was driving home on the highway exited, stopped at a light and the car stalled. The car had been running for a good 30 plus minutes at this point and was at normal operating temp. It started right back up, but would not go into drive and would only move in reverse and low. I got the car home parked it and waitied until the weekend. This past Saturday I pulled it out checked the transmission fluid, linkage, etc and all was good. The car started, i let it warm up and took it for a drive. The car shifted fine and had no issues. About 30 minutes later I went out again, stopped at a reed light went to hit the gas and it died. Now it will start idle fine, doesnt idle rough or sputter, but anytime the car is warm after running for a while and I stopped the car dies when you hit the gas, at higher RPMs(cold start or when already in motion at higher speed) it doesnt have this issue. Any thoughts, could it be the fuel pump?