RX7 AFM issues
 

I picked up a RX7 AFM to potentially use on my 91 with 99 1.8 swap. I did the resistor mod and I loosened the clockspring by 9 clicks which seemed to be the best setting. The issue I'm having is that I have the check engine light lit up when using the RX7 meter(even on my 90 with 1.6). Swap to the 1.6 meter and it goes away. I'm pretty sure that isn't normal. I drilled out the idle screw but haven't tried adjusting that yet. Any advice (other than getting MS).