* Misfires: The engine will run rough, possibly shaking violently.
* Reduced power: Acceleration will be sluggish and the car may struggle to climb hills.
* Poor fuel economy: Unburnt fuel will be wasted.
* Check engine light: The check engine light will almost certainly illuminate.
* Damage to the catalytic converter: Unburnt fuel entering the catalytic converter can overheat and damage it.
While you might be able to limp it to a mechanic, driving for extended periods with a bad ignition coil is strongly discouraged due to the potential for further engine damage and safety concerns. It's best to have it repaired or replaced as soon as possible.