You might want to check the fuel filter and lines for any blockages or leaks, as these can cause rough running and starting issues. Also, inspect the carburetor for any dirt or clogging, as a thorough cleaning might help. If your model has a fuel pump, ensure it's functioning properly. Look into the ignition system too, as any faulty connections or components can affect performance. If these steps don't resolve the issue, consulting a professional might be the best next step. Good luck!