When should you replace the coil packs?

Coil packs should be replaced when you notice symptoms such as misfiring, rough idling, decreased fuel efficiency, or the check engine light illuminating. Additionally, if you experience difficulty starting the engine or notice an unusual increase in exhaust emissions, it may indicate that the coil packs are failing. Regular maintenance checks, typically every 60,000 to 100,000 miles, can help determine if they need replacement before issues arise.