Lacking Low RPM power

[Lotus49]

Hey my 94 z28 has 160k on it... its lacking power only under 2500, but at 3000 it feels like im being slammed into my seat. So i changed the plugs, wires, fuel filter, air filter(K&n), and it cant even spin the tires if i just floor it, but after 3000rpm's ill kick out. Its really sluggish under 3g's, But incredably fast above that

[4onFloor]

maybe a transmission problem?

[Dober89]

Did you gut your cat or do any other mods?? Sometimes gutting your catalytic convertor can hurt your low end torque.