Ok, so I finally got the ecu jumper harness from password jdm and just had it put on. Now my car runs smooth like a champ! Before putting in the obd1 gsr ecu, I was using a obd2b si ecu. My car was running like crap. It felt like I was miss firing all the time whenever I was under 4k rpm. Now that I have the gsr ecu in, it's finally running how it should. My question is, does anybody know why it did that and what caused the car to run like crap? My motor is a 94 gsr into a 99 ek coupe. Thanks in advance for any feedbacks!