I have seen people saying how their cars vibrate on idle. Mine does the same but it’s because I have adjusted above from +25% to -12.5%.
The vibrations may not necessarily be due to engine problems, it maybe due to fuel trim ratios.
Mine is a 2003 corolla nze
kimalel alituambia pia shell vpower inaleta hio shida
Kama hio vibration huisha ukikanyaga accelerator kiasi tu then mostly inaesa kua idling iko down
If not spark plug, mostly bad air/fuel ratio sensor if idling rpm is low. broken engine mount could also cause take off vibration.
Check also your PCV valve (Permanent Crankcase Ventilator).
When it’s dirty, it has a tendency to cause that.