Spark plugs are one of those maintenance items ... Misfires, especially, will usually trigger a check engine light, but other symptoms of a bad plug are often undetectable by a vehicle's onboard ...

However, if your car is guzzling more fuel than usual or has symptoms like rough idling or hard starting, it may be time to replace the plugs. Not only will bad spark plugs diminish your car's ...

And like spark plugs, ignition coils can slowly degrade and fail throughout extended periods of time. With symptoms similar to that of bad spark plugs, faulty ignition coils are a fairly easy ...