Okay guys i just did a mpfi swap on my brothers ef sedan lx the cars runs and idles fine but after 2nd gear hits limp mode and wont go past 3500 rpms and the check engine lights comes on i've checked the wiring and do not see where it could have gone wrong the cars will run and drive like it is but just wont rev higher than 3500 rpms after 2nd gear when you try to get on it can someone please help got to get this thing going straight before import alliance. Quick run down on the mpfi swap

Its running a p06 ecu
obd1 d15b7 injectors
obd1 intake manifold
obd1 d15b7 dizzy