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These intake manifolds are prone to developing oil leaks through their tight clearanced seals and are non repairable. Another common fault is when the engine starts to develop irregular idle and stalling is a typical giveaway that the manifold is worn and needs replacing. This is due to the needle pinned swirl flaps that break off or get sticky.

Most late-model engines come factory-equipped with plastic intake manifolds. Plastic saves weight and cost, and conducts heat much more slowly than aluminum or cast iron. This helps lower the temperature of the incoming air for a denser, more powerful air/fuel mixture.