I've zeroed it out for now. spark is pretty stable and hasn't changed. The surge cycles about 1-2 seconds
I've tried to slow the iac down some without any success.

I suspect these injectors might be struggling at a 1.2mS pw. They're still on the rich side atm about 0.92 Lamda.
I suspect a "misfire" might cause a lean flare, but this oscillation is very regular.

Thanks
Mitch


The last injectors were idling around 1.6m$, both are 45lb