Bad coil pack

Hi, my name is Devin. I am an auto repair expert with the Car Genius team here at RepairPal. I'm sorry to hear you're having trouble with your vehicle. A bad coil pack in your Focus could cause engine misfires, rough idling, or hesitation while driving. You might also experience poor acceleration, decreased fuel efficiency, or a check engine light coming on. I recommend using a diagnostic scanner to read the engine codes, which might point to a misfire and indicate the faulty coil. Swapping an ignition coil suspected to be defective with a known good part is a quick diagnostic method. If you need more advice, have any other questions about your vehicle, or would like to get connected to a RepairPal Certified shop near you, we have you covered. Give us a call at 877-913-1554, and we will happily help you out!