An 89 9C1 would be equipped with a
L98 cam which might be the closest thing to your set up although it does have larger injectors.
What rpm are you trying to set the minimum air/idle to? In a earlier post, you mentioned your idle of 650 rpms. Problem may be that the PROM bin is targeting 500-525 @ 95-100C* and you're trying to set it to a higher rpm. Once the IAC is reconnected, it will target 500-525 rpms by closing the IAC to the point it can't close it anymore and you lose some control-ability. One other thing, do you have a functional park/neutral switch? If not my understanding is to run it open.
Bookmarks