I took a look under the hood yesterday to see that at least one spark plug was having a fireworks show of itself, what kind of damage can this do? Does hp/performance drop because of this? I gotta get me some plugs and wires, but in the meantime can this cause any damage or no. I finnally figured out why i had a rough idle lol. And i think ill be changing my o2 sensors also. I currently get around 11 mpg if that, with new plugs and wires and sensors, should my mpg increase considerably? Thank you guys for the info!

 

Don't think it will cause any serious damage other than running like crap. Mine did the same thing and some new wires fixed it right up....that and some plug wire boots to keep them from frying so quick.