Yes replacing your old spark plugs in your car or truck can help to improve engine performance and even gas mileage.
Faulty spark plugs can cause rough engine idling, engine stalling, loss of engine power, engine hesitations and engine surges, poor acceleration.
If your experience engine performance problems or any of the above symptoms then it's likely that y our spark plugs need replaced.
Spark Plugs should be replaced every 100,000 miles or sooner if your engine is performing poorly.