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• 10:54, 6 July 2026 Cliff talk contribs created page Vacuum leaks (Created page with "'''Vacuum leaks''' are a common cause of drivability problems on the Pontiac Fiero. A vacuum leak allows unmetered air to enter the engine, which can affect idle quality, fuel mixture, throttle response, emissions, and ECM control. == Overview == Vacuum leaks can occur in hoses, intake gaskets, vacuum fittings, brake booster lines, EGR components, throttle body gaskets, or other intake-related parts. Symptoms may differ between the 2.5L four-cylinder engine and t...")