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To clean the throttle body of a 1990 Cadillac Sedan Seville, first, disconnect the battery and remove the air intake duct. Carefully detach the throttle body from the intake manifold by unscrewing the bolts. Use a throttle body cleaner and a soft brush or cloth to wipe away carbon buildup and grime inside the throttle body. Reassemble everything, ensuring all connections are secure, and reconnect the battery before starting the engine.

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