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Could iacv valve make 94 jimmy 4.3 vortec vin w run rough?

Yes, a faulty IAC (Idle Air Control) valve can definitely cause a 1994 GMC Jimmy 4.3L Vortec engine (VIN W) to run rough. The IAC valve controls the amount of air entering the engine at idle. If it's malfunctioning, it can lead to an incorrect air/fuel mixture, resulting in rough idling, stalling, or poor performance. A dirty or sticking IAC valve is a common culprit.
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