1. Clogged fuel filter and / or pipelines of the engine power system (see «Supply system»).
2. Faulty fuel injectors (see «Nozzles - check and replacement»).
3. Spark plugs are faulty or the gap between the electrodes is incorrectly set (see «Spark plugs - replacement» or «Engine spark plugs 1.61 - replacement»).
4. Damaged insulation of high-voltage wires (see «High voltage wires - check and replacement»).
5. Faulty engine management system (see «Checking the technical condition of the engine management system»).
6. Insufficient compression in the engine cylinders (see «Compression in the engine cylinders - check»).
7. Leakage (burnout) gas distribution valves (see «Cylinder head - checking and lapping valves»).
8. Faulty ignition system (see «Checking the technical condition of the engine management system»),
9. Leaky vacuum hose connections (check the tightness of the fit on the fittings).