My car is misfiring due to a possible coil problem.
An ignition coil could very well be the cause of your concern. If the diagnostic trouble code shows the cylinder being affected, the ignition coils can be switched to see if the misfire follows the coil. Other issues such as lack of fuel, air, or even mechanical issues can be the cause of misfires. A diagnostic inspection of your misfiring issue should be performed by a qualified technician like the ones offered here at YourMechanic to ensure the fixed right the first time.
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