okay so i bought a 91 si with a b16a already swapped in it. ran good for first week or so, than boom it started bogging down, it would randomly start almost feeling like there was a fuel cut off and it would pull out of it, noticed fuel pressure regualor was blocked off, i fixed that, it stoped bogging but still feels like it might be missing and a noticeable amount of power loss. i pulled cap and rotor they look almost new, it just started throwing code 8 on a pr3 but all wiring is good? its got a jumper harness so its not a all cut up harness, Any ideas guys? i hate to take it to a shop as im trying to do this entire car myself from the point i bought it on.