The lack of dynamics of VAZ-2108/09/99 with carburettor (as with the injector) indicates too poor a fuel-air mixture or a violation of the timing of the ignition angle (too early ignition). If the problem has not disappeared after adjustment of the ECP, it is necessary to check the performance of the carburetor acceleration pump as well as the leakproofness of the gasket between the carburettor and the intake manifold. If after this check the result has not improved, it is necessary to turn to the specialized service for adjustment or (and) repair of the carburettor.