Your Bronco’s spark plugs won’t last forever. On average, spark plugs need to be changed every 30,000 miles. If your Bronco’s been in harsh environments or hasn’t been started in a while, the spark plugs may also be faulty.

Bad spark plugs can result in some obvious symptoms, like uneven idling or misfiring. But some of the symptoms of bad spark plugs are harder to notice right away. Not getting smooth acceleration or the fuel economy you should are also symptoms of a faulty ignition system. Spark plugs are the most likely culprit.

OEM-style replacements will get your Bronco back in working order. If you’re looking for a higher-quality upgrade, iridium spark plugs are also available. Iridium spark plugs offer improved durability and conductivity. The result is better performance for a longer period of time. They're also a direct-fit replacement, so no modifications are needed.

Bronco spark plugs are available from top companies like Autolite, MSD, and NGK.