83 Rx 7 wont accelerate under load above 4K
 

have rebuilt carb professionally, knocked all catalyst out of plugged converter, fixed all vacuum leaks, vatted fuel tank, put new lines and filters on, idles great but wont accelerate under load. feels like not getting any fuel. have done flow test on pump. plenty at 3-4 psi. am really getting frustrated....any ideas?? thanks. DrJ