i have a 77 280z and it loses power/bogs between about 3200-3700 rpm. its more noticeable at WOT because the power diff is larger, but it is still there under partial throttle. it pulls before that rpm, bogs, then pulls really hard as it hits the powerband. ive replaced the ign. coil, cap & rotor, wires, plugs, fixed several vac leaks (not sure if ive gotten them all ><). car has 138k miles on it. it didnt do it about a week and a half ago, but now it does it constantly. i have the timing set at about 13* BTDC.
i r teh confused....