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To check the EGR valve on a 1991 Mitsubishi Mighty Max, first, locate the valve, typically found on the intake manifold. Remove the vacuum hose connected to the valve and inspect it for any cracks or blockages. Then, with the engine running, manually apply vacuum to the EGR valve to see if it opens; you should hear a change in engine sound. If the valve does not open or shows signs of carbon buildup, it may need cleaning or replacement.

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