1. Loose or damaged ignition coil electrical connections (see «1.6i engine ignition coil - check and replace»).
2. Insufficient pressure in the engine power system (see «Checking the technical condition of the power system»).
3. Leaky connections of the parts of the intake tract (see «Inlet module - removal and installation», «1.6i engine intake and exhaust manifold gasket - replacement» And «1.6i engine reservoir - removal, replacement of seals and installation»).
4. Faulty engine management system (see «Checking the technical condition of the engine management system»).