weak acceleration

well after swapping ZC(sohc) into friends STD hatch and coverting to mpfi the car stumbles like its getting to much fuel or somthing in the lower rpm's 0-3k upon acceleration. after 3k it hauls a#@. what could be problem? could it be map sensor? no codes either.

any codes ?

sounds like maybe another zc with a timing issue. check that shit out. and lemme know if your not sure how to.