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Lanos 1.5 Idle Speed Floats We encountered this problem, the idle speed floats on the Lanos 1.5 car. We replaced the spark plugs, wires, filters, but the situation did not change. They float both on gas and on gasoline. The culprit was the fuel pressure regulator, in which the gasket was leaking, and gasoline entered the manifold, thereby enriching the mixture. After replacing the regulator, the car does not triple and the idle speed does not float.