Ok here my problem and try searching all day and still nothing online. I order a obd1 ecu and when I install it the idle surges nonstop even warm it up and drove it around the block still same problem. My stock ecu works fine the reason for me getting is that I just recently rebuilt my head and some how I broke my knock sensor and also I have a high flow cat that gives bad o2 reading but it only my secondary sensor. Also with the knock sensor not plugged in my stock ecu jumps to limp mode where my limiter at 4K. The motor is a f23 accord motor. Any help or and double checking certain areas will be great help

 

Ok figured I have change my iacv to a 2 wire instead of 3 so I have to go junk yard and search for one. But in the mean time can I just leave it unplug. Car starts and idled fine a little on the high side bit no surging at idle anymore. It surges a little bit when I tap on the gas but driving its fine