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What causes a 2000 sable to rough idle when cold but a smooth idle when engine is warm?
Wiki User
∙ 12y ago
Most likely bad intake manifold gasket. When the engine is cold the engine shrinks which unseals the intake and allows a small amount of unregulated air into the engine causing it to idle rough. as the engine heats up it expands sealing the leak causing idle to improve. You should also get lean codes from the computer as the engine is running to lean. Very common problem with the DOHC engine.
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Wiki User
∙ 12y ago
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