How Do I Know It's Time To Replace My Spark Plugs?
An engine which misfires - meaning the spark plugs fire at the wrong time -- could be the result of worn or fouled plugs. Other indications of worn spark plugs are poor fuel economy, hard starting, and sluggish acceleration.
How Often Should I Replace My Spark Plugs?
Spark plugs should be replaced at least every 60,000 miles.
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