An engine intake manifold is a component in a motor primarily engineered to evenly distribute fuel and air into the firing cylinders. There are some engines in which the intake manifold is only designed to distribute air. The intake manifold has two major components. There is an air chamber called a plenum that circulates air to the cylinders and runners that impact the available power at high and low RPMs. Carburetors and fuel injectors spray fuel into the intake manifold where it mixes with the air forced into the runners from the plenum. The air and fuel mixture flows into the engine's cylinder where the spark plug ignites the fuel. Intake manifolds can also be used to provide power to other vehicle components due to the high manifold vacuum pressure. Among the components that receive some power created by the manifold intake's vacuum are the cruise control system and power assisted brakes.