SAFC NEO hiding a bad MAFS?

[SmilingFox_Sil80]

I've spent the last couple of days chasing a misfire on my redtop SR, checking and soddering all the wonky connections. I thought a bad connection in all my SAFC NEO wiring could cause the problem. So to see if it worked ok I removed it.

(I have the SAFC wired into a wiring extension so its only a matter of removing the 6 inch extension to hook everything up like stock)

At first it ran ok and I could hear the misfire, it even leaned out to a good 12-13 AFR. Then everything went wrong, the engine started heating up and the misfire came back, and it got leaner, then the misfire got worse, and the engine started going really lean, 17 to --(!). Then the misfire became constant and the AFR wandered between 15 and 18 until the car finally died.

I reconnected the SAFC and the engine ran ok again (slight misfre but drivable as before). So I got to thinking, the SAFC takes the intake signal and modifies it according to its settings. It gets that signal from the MAFS, could the MAFS be sending a bad signal when hot and the SAFC be correcting it, maybe taking a jumpy voltage and stabilizing it somewhat? Is this in the realm of possibility? Or am I way off on this?

And as a question about my original misfire problem, if a coil goes bad would it still Ohm out ok, and has anyone had the Coil Harness go bad on them?

[SmilingFox_Sil80]

Update: The ECU seems to have adjusted to not having the SAFC, but its still going very lean, to the point that at low rpm (1100-1400) the is car shuddering when its moving. At idle its fine. I've tried pulling codes from the ECU, but I couldn't seem to get it to work. I put the ignition in the on position and the LED flashes for a fraction of a second, and thats it. If I put it in ACC the LED will turn on for a second, then turn off. I've tried turning it to mode 2 to read the codes from both positions but no blinking whatsoever, no 55, nothing. The LED also will blink once when I turn the car off, but only sometimes. Anyone know what I'm doing wrong?