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 and lean afr around 18-20 its 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)

 

Sounds like you still have a vac leak. Where was the vac leak at?

Did you have to replace the engine harness or the ECU conversion harness?

Check all grounds a bad ground can screw up the ECU.

I assume your using Hondata in the ECU? or a stock ECU? any check engine lights?

Have you checked or cleaned the IACV yet? Try removing it and clean it out with brake cleaner.