1. Vacuum hose connections are not tight (check the tightness of the fittings).
2. The air filter is clogged (see "Air filter - replacing the filter element").
3. Insufficient fuel pressure in the engine fuel system (see "Checking the technical condition of the power supply system").
4. The cylinder head gasket is damaged (see "Cylinder head - removal and installation" or "Cylinder head of the 1.6i engine - removal and installation").
5. Wear of the timing belt and/or tension roller (see "Timing Belt - Checking Condition" or "Timing belt drive engine 1.6i - checking the condition and adjusting the tension").
6. Wear of the camshaft cams (see "Camshafts - Removal and Installation" or "1.6i Engine Camshaft - Removal and Installation").
Engine speed at idle speed alternately decreases and increases (Kalina 1119)
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This article has been reviewed: Polina Kudryashova
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