ok....so when i my b16(first gen) it had a broken knock sensor. and it wanted to drive my car, so i put in a zc ecu. so the zc ecu ran fine but i didnt enjoy a 5,500 revlimiter. so now, last night i got my new knock sensor in and put the b16 ecu in. now it starts up and throws a code 1 and 4. i know what they are. but it wont hold a idle, and when i drive past 3,000 rpms th rpms will go back down. so does anyone know why the b16 ecu runs bad?