Which component is likely to be connected to a faulty ignition coil?

The ignition coil plays a crucial role in the ignition system by transforming the battery's low voltage into the high voltage required to create a spark at the spark plugs. If the ignition coil is faulty, it may not generate enough voltage to ignite the fuel-air mixture in the combustion chamber, which directly affects the performance of the spark plugs. This malfunction can lead to misfires, rough idling, or failure to start.

Connecting the spark plugs to a faulty ignition coil highlights the dependency between these two components; the coil supplies the necessary high voltage to the plugs, and if the coil isn't functioning correctly, the plugs won't receive this crucial voltage to create the spark needed for combustion. The relationship is vital for engine operation, solidifying why this answer is the most relevant in the context of a failing ignition coil.