ever since i put my b16 in 4 months ago i get hesitation now and then. like if you try to go wot it jerks a little,speeds up,jerks more,then finalyy kicks in.most of the time its great though.but i want it smooth all the time. i have replaced plugs,wires,dizzy seems fine,ignition timing looks allright,fuel filter is not old,and i have no codes on my pr3 ecu at all. anyone got any ideas???? oh and i only use 93 or better gas. thanks!

 

Given all the things you have allready check I would say the ignitor could be going bad. It's common and I have seen them do exactly what you said buck and miss and then run fine for awhile.