Alright I got the swap done on my 91 civic HB but its not running like it should. It idles rough at times and sometimes it doesnt rev like its bogging or something and then sometimes it jerks back and forth in 1st and 2nd gear unless you go WOT. The engine is a B20 with a P06 ECU. Would a tune with Crome solve the problem? Someone told me it needs to get tuned which would result in no need for the O2 sensor, someone else said it needs an 02 sensor, and someone else said I need to change ALL the sensors to OBD1. Also how would check for trouble codes with OBD1 in an OBD0 car? The ECU doesnt have the blinking light on it and I already searched too.