Will a bad ignition coil cause car to sputter?

Yes, a bad ignition coil can absolutely cause a car to sputter. The ignition coil provides the high voltage needed to create the spark that ignites the air/fuel mixture in the engine's cylinders. If a coil is failing, it may not provide sufficient voltage consistently, leading to misfires. These misfires manifest as sputtering, rough running, or even stalling, depending on the severity of the coil's malfunction.