So today I was on a little bit of a road trip and bout 20 mins in or so the RPM gauge jumped slightly and went back to normal. My dad was driving the car at the time and so I didnt really notice. He pointed it out and im like maybe it was just a fluke deal. It happened a couple and i knew something was up and it maybe happened 10 times or so that i noticed. None of which were that big of a deal but i figured if i let it go itll just get worse. My car currently has about 143,000 mi and i no for sure that the plugs and wires havent been changed in the last 23,000 and i am not sure if they have ever been changed or not. It seems like this would be a reasonable place to start in dealing with a slight misfire seeing as how things normally wear out over time. Im not too sure on how often plugs and wires need to be changed but i figured id post this to see if anyone has any second opinions on this.