[Delawarebird]

First let me say I haven’t owned a vehicle with a quadrajet for a very long time. That being said I recently purchased a 1978 Trans Am with a pretty stock L78 400. Gave the car a complete tune up and had the original quadrajet rebuilt. Problem since day one has been from a standstill if I put the peddle to the floor the car falls flat and sometimes stalls out. Running down the road if I ease the peddle down I can feel when I hit the secondaries and the car has a slight stumble then goes. I moved the accelerator pump shaft closer to the carb for a longer pump shot with minimal to no difference. Car is pretty responsive for a car with 2.41 gears as long as you stay out of the secondaries. Have also tried tightening up the secondary spring, currently at about 3/4 and they feel pretty stiff. Side note vacuum advance is on manifold port, seems to run better there than on ported. Any thoughts would be appreciated, just not sure if the problem is too much fuel or not enough