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To adjust the idle speed on a 1978 Cadillac Seville, locate the idle speed screw on the carburetor. Start the engine and let it reach operating temperature. Use a tachometer to monitor the RPM, then turn the idle speed screw clockwise to increase RPM or counterclockwise to decrease it, aiming for the factory-recommended idle speed (usually around 600-700 RPM). Finally, recheck the idle after adjustments and ensure the engine runs smoothly.

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