* The carburetor is dirty or clogged. This can cause the engine to run lean, which can lead to surging and fluctuating RPMs.
* The fuel filter is dirty or clogged. This can restrict the flow of fuel to the engine, which can also cause surging and fluctuating RPMs.
* The spark plug is worn or damaged. This can cause the engine to misfire, which can also lead to surging and fluctuating RPMs.
* The ignition coil is faulty. This can cause the engine to not produce a spark, which will prevent it from running.
* The throttle linkage is loose or disconnected. This can cause the engine to run at a high RPM when the throttle is released.
If you are experiencing any of these problems, it is important to take your engine to a qualified technician for diagnosis and repair.
