I live in Florida and enjoy the weather here. I’m having issue with my 2000 Honda Civic LX D16y7 motor.
i recently did new head gasket, exhaust gasket, intake manifold gasket all from Honda. I replaced with used throttle body and new gasket, iacv and map sensor. Still having PO505 code.

after more research I found that I had to reset the ecu. One site said remove ecu fuse and backup. Worked fine and drove for 30 miles and code appeared again. Replace the iacv again from O’Riley and did a reset on the ecu as well now with the negative battery terminal removal for 15 mins then I turned it on and let it run for 15 mins. Have the PO505 code again and idle is fluctuating now. I need some guidance.