In such cases, the ignition coil may deteriorate or fail.
Does not turn up when accelerated
Not easy to get on the engine.
Unstable idle
Engine check lamp (MIL) light up.
In an internal combustion engine with spark plug in order to discharge in the combustion chamber of the compression process requires a high voltage of 20,000 - 35,000 V. Ignition coil is a type of transformer that converts a 12V battery voltage to the high voltage required to discharge the spark plug. Basically consists of primary coil, secondary coil, and core (iron core), between pieces are filled with epoxy resin to ensure insulation.
Images are samples. Please check the manufacturers website for product details