Irregular engine at low speeds

[Jam24]

I recently noticed irregular RPM on my bike at low speeds and when idling. It seems to have gaps in its rhythm. At higher speeds, everything seems to work fine. I haven’t noticed any other strange sounds (clanking or knocking or anything like that). Does that sound like spark plugs or a carburetor problem? Any suggestions about what might be wrong or how to accurately diagnose the problem would be greatly appreciated! Thanks!