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The Intake Manifold is a Collection of tubes through which the fuel-air mixture flows from the carburetor or fuel injector to the intake valves of the cylinders of an internal-combustion engine so that the right amount of air and fuel can mix. On the rare occasion when a manifold leaks, too much air enters the cylinders, making the internal combustion process less efficient. One sign of a leaking manifold is sluggish acceleration.