i have a '96 accord lx w/ '93 JDM H22a swap and JDM obd-1 p13 ecu so i can't just plug in a code scanner and get DTC's. idle would bounce from 1000-1500 rpm when at a stop (hot or cold). idles fine when car is moving (neutral, clutch in or out). searched and found some stuff about FIT and IACV. I adjusted the FIT and swapped IACV (not new, just another used one), now the car idles fine when it's cold (seems like the FIT works), but goes right back to bouncing when it warms up (seems like the IACV doesn't work but i want to know for sure before i drop over $200 on a part i may not need).
Also there is a port on the top left of the inside of t-body & if i cover it with my finger so that only a little air gets by, it idles fine. if i plug it entirely it stalls. is this port to the IACV or FIT or something else? i have also checked all vacuum lines for leaks and found none. i am new to honda tuning/maintainance any help would be appreciated. thanks.