 on time where you know spark plugs uh normally last for about a hundred thousand miles and it wouldn't be a bad idea you know in the future to try to maintain the vehicle and have the spark plugs replaced because a spark plug as it uh wears the gap will open up and as the gap opens up of course uh that can also create a misfire because the spark is not firing from the center electrode to the ground electrode it may be firing internally in the plug but