A spark plug can look “bad” in several very different ways. A dry black coating may point to incomplete combustion, […]

A rough idle, hard start, or sudden drop in fuel economy can make a driver suspect a failing ignition coil

A car that suddenly shakes at a stoplight, hesitates while accelerating, or takes longer to start may be dealing with

A rough idle, hard starting, misfires, or a sudden drop in fuel economy can point to a spark plug that

Ignoring worn spark plugs can turn a minor tune-up issue into rough driving, poor fuel economy, or expensive catalytic-converter damage.

A rough idle, a hard start on a cold morning, or a sudden drop in fuel economy can make a

Is a shaky engine at a stop a simple tune-up issue, or a warning of something more serious? A rough

A vehicle with worn spark plugs may still start, idle, and drive, which can make the problem seem harmless. In

A worn spark plug can turn a small maintenance issue into a rough-running engine, poor fuel economy, a failed emissions