been posting for days i know its something simple:

i recently swapped my b20 into my da 91 and ive had a lot of problems with it but i finally can drive it. as the title says my idle is wierd. its at about 2k and the onlything i can think of is a leaking hose or timing off, but i did not mess with my timing at all and if i retard my dizzy so it idles low then my car just shuts off when i turn the ac on . now heres my conclusion . on the IACV theres those 3 little screws on the bottom where the line goes in , well one of them broke off so i just used some vice grips to get the rest out but i don have the screw and i dont know where to get it , could this be the reason it idles so high , anti freeze does drip out very slowly.....any conclusions?

 

That passage on the IACV is for coolant.

To check for vacuum leaks, remove the intake, start the car, and block the throttle body inley with your hand. If the engine stalls, there is not leak.

If the engine did stall, check the IACV, the FITV, and the throttle plate closure.