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Can the microrusefi run a 4 wire stepper motor for iac, like the ones on a chevy system? The system wi have cable operated trottle.

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yes microRusEFI can drive 4 wire idle air valves see setting at https://github.com/rusefi/rusefi/pull/3749

Added to https://github.com/rusefi/rusefi/wiki/Hardware-microRusEFI#faq