I had 550's with no fuel control on an A/T ECU and the car ran but got shit milage because it was running rich.
I can't imagine the car not being able to even maintain an idle would be related to the AFC settings.
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1992 Eagle Talon TSi AWD
320awhp/320lb-ft tq
12.772 @ 108.57
1992 Mitsubishi Galant VR-4
678/1000
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