Method for controlling a gas engine during low power operation; wherein the gas engine comprises at least one cylinder and a device; the device comprising: an intake manifold from which an intake duct leads to the at least one cylinder; at least one fuel supply line opening into the intake duct; an intake tract comprising a first shut-off device and connected to the intake manifold; a main line which is connected to the intake tract and in which a second shut-off device is arranged; a bypass line branched off from the main line in the direction of flow upstream of the second shut-off device and connected to the fuel supply line; a gas line supplying the main line with gas; and an air supply line supplying the intake tract with air, which is arranged in the direction of flow between the second shut-off device and the first shut-off device, and the method comprising the following steps: in the starting phase, the second shut-off device is closed so that the fuel supply line is supplied with gas from the bypass line and the intake manifold is supplied with air from the intake tract and a gas-air mixture is formed in the intake duct; the mixing ratio of the gas-air mixture in the intake duct is controlled by the first shut-off device in such a way that, by throttling the supply of air, a variable negative pressure is created in the intake manifold, by means of which the supply of gas from the bypass line is controlled. wherein the gas engine comprises at least one cylinder and a device; the device comprising: an intake manifold from which an intake duct leads to the at least one cylinder; at least one fuel supply line opening into the intake duct; an intake tract comprising a first shut-off device and connected to the intake manifold; a main line which is connected to the intake tract and in which a second shut-off device is arranged; a bypass line branched off from the main line in the direction of flow upstream of the second shut-off device and connected to the fuel supply line; a gas line supplying the main line with gas; and an air supply line supplying the intake tract with air, which is arranged in the direction of flow between the second shut-off device and the first shut-off device, and an intake manifold from which an intake duct leads to the at least one cylinder; at least one fuel supply line opening into the intake duct; an intake tract comprising a first shut-off device and connected to the intake manifold; a main line which is connected to the intake tract and in which a second shut-off device is arranged; a bypass line branched off from the main line in the direction of flow upstream of the second shut-off device and connected to the fuel supply line; a gas line supplying the main line with gas; and an air supply line supplying the intake tract with air, which is arranged in the direction of flow between the second shut-off device and the first shut-off device, and the method comprising the following steps: in the starting phase, the second shut-off device is closed so that the fuel supply line is supplied with gas from the bypass line and the intake manifold is supplied with air from the intake tract and a gas-air mixture is formed in the intake duct; the mixing ratio of the gas-air mixture in the intake duct is controlled by the first shut-off device in such a way that, by throttling the supply of air, a variable negative pressure is created in the intake manifold, by means of which the supply of gas from the bypass line is controlled. in the starting phase, the second shut-off device is closed so that the fuel supply line is supplied with gas from the bypass line and the intake manifold is supplied with air from the intake tract and a gas-air mixture is formed in the intake duct; the mixing ratio of the gas-air mixture in the intake duct is controlled by the first shut-off device in such a way that, by throttling the supply of air, a variable negative pressure is created in the intake manifold, by means of which the supply of gas from the bypass line is controlled.