Rough idle and misfire
Worn plugs can cause a rough or shaky idle, hesitation on acceleration, or an active misfire — often accompanied by a check engine light with a misfire code.
Poor fuel economy
If the plugs aren't firing efficiently, the engine burns more fuel. A noticeable drop in fuel economy alongside rough running can point to ignition wear.
Hard starting
Worn plugs can make the engine harder to start, especially in cold weather. If starting is sluggish, the ignition system is one place to look.
Want us to take a look?
These articles are general guidance — not a diagnosis of your car. Bring it to Happy Cars at 12935 W Colonial Dr, Winter Garden, FL 34787 and we'll inspect before we recommend any repair.