Just put a B16a into my 91 si crx a week ago. The motor was sitting a while in Japan. I got it over here to through in my rex. The swap went easy. It runs good, no check engine light, idles smooth. My problem is: When cruising at around 4 grand, it hesitates when accelerating until you hit v-tec. Its almost like a miss fire but not quite. I have already done plugs, wires, rotor, cap, coil, ran seafoam through it, and injector cleaner. I also swapped out the TPS sensor today but no difference. Any ideas?