if it is ignition coil/spark plug, the engine will vibrate abnormally even at rpm >1.2k.
if crankshaft positioning sensor dead, need to press hard on accelerator, the rpm will raise up but engine no torque (from my experience).
If it just dead on idling, then could be vacumn leak, or fuel pump... i think.
Also check oil/water/temperature if they are in normal.

Bring to service center to check all the sensors.