Sputtering when stomping on it...??? Help..

[rbr4155]

I have a weiand 144 on a 400 sbc which runs fine under normal to medium throttle, but really begins to sputter when i stomp on it. I'm running around 8psi of boost w/ the blue holley fuel pump, fram race filter and holley 750 vacuum secondary. I can't seem to figure out what the real prob. is although i keep tweaking the jets and timing but haven't gotten it fixed yet.

Thanks for the feedback in advance.



Ryan