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Yes, the idle air control (IAC) valve can indirectly affect transmission performance. The IAC regulates the engine's idle speed by controlling the amount of air entering the engine when the throttle is closed. If the IAC is malfunctioning, it can lead to erratic idle speeds, which may cause harsh shifting or slipping in automatic transmissions due to inconsistent engine RPMs. Therefore, while the IAC primarily affects engine performance, its impact can extend to the transmission's operation.

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1w ago

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