Greetings new member here with an H22 Dc2 that needs help
 

I have this h22 dc2 ive been slowly building for the past 2 years, it's actually been finished over a year ago but since had to replace multiple wire harness and ecu. Does the H series stand for headache because this low mile jdm motor has no issues when i first got the car tunned but the past year only been up 4 months which it didnt skip a beat back then and it would still if I could get to the root of whats in these harness that keep destroying my ecu. also had bad vac leak for the longest finally got it sealed up but still idles weird af lean afr around 18-20 is normal driving but bogs a bit like its still sucking air and sounds like a turbo car at idle the way its chugging.(its na)