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if this is an ECU problem,how do I fix it? Any1?

i just installed a jdm moter in a 99 prelude and it breaks up at low rpms on a load .when its out of gear (its a 5 speed) it revs nice and smooth but, when on a load it breaks up. if i play with the gas it smooths out ,but if i floor it it breaks up . the speed sensor doesnt work because of the...