Engine stalling when you give it too much throttle on take off

[skyman2112]

Carbureted engine, PCM 351 BOSS. So far tried rebuilding original carb, then purchased another factory style carb, then replaced fuel pump and then replaced the factory ignition and finally, got a completely different brand new holley carb. Nothing every changed, Stalls when you give it too much throttle from a stand still. In cruise, accelerates fine when you give it full throttle. You can see the accelerator pump working too. Really going crazy with this one. thinking vacuum leak maybe PCV valve?

 

[kenny nunez]

Have someone watch the secondary butterfly linkage when you punch it. The linkage should not move until the engine starts to turn up. If it does move try to restrict it and see if does not bog or stumble.