Ek runs like shit
 

I just bought a p28 and a jumper harness for my ek hatch.
I havr a singlr cam zc vtec. The car was running on a p2n, the ecu off the
Hx model. Vtec hits at 3500rpms, and ran ok, well with the check engine light on. Two codes, the o2sensor and speed sensor when i put the p28 on it. Check light goes off then 2seconds later it
Comes on again.. And i cant check the codes cuzz the code reader says no
Link.. And the car runs like shit.. it boges out when i take off, when i hit
4gran the cae runs like it should... i put the p2n back in it and the check light
Is off for 2days. the p2n still runs it like shit vtec hitting at 3500rpms and no
Power... Mh boy told me a that the red jumper harness always fuck up.
Told me to get the black jumper... can any one help or know about this?