89' Ka24e = no power under 3000 rpms

[Napalm350z]

I have an 89' 240sx that will not pull until it hits 3000 rpms. It spits and sputters until it hits 3000 and then it launches and runs perfect beyond that. Even at WOT, it slowly accelerates and runs rough until 3000 rpms and then smoothes right out. It also idles fine in neutral and park, but in drive, etc, it misses and runs rough idling.

It has a brand new K&N OE style air filter, new TPS, new FPR, new fuel filter, new 02, new NGK OE type plugs, new wires, new coil, new distributor cap and rotor button. I seafoam'd it today and it helped a little bit, but still runs like total crap.

Any idea what could be causing this?

UPDATE: It runs great until two minutes after the engine has been started then it gets rough again. What i have been doing is turning the engine off and turning it back on every few minutes to keep it running smooth because it cannot take off from red lights or anything like that or even drive up hills until i restart it.
Modified by Napalm350z at 8:02 PM 8/5/2008

[spindrift187]

check your vaccuum hoses for cracks.

[KoreanNoob]

yo did u try to check the timming of the car? or what about intake leak did u also check the maf vac check?