Just bought a 2003 Hyundai Tiburon GT. I knew it had a misfire problem but for $100 ill take my chance at fixing it. So the misfire only happens when the gas pedal is pushed over half way down. I haven't checked codes yet on it when it does pop a check engine light since I just got it yesterday. The last owner said he changed the spark plugs and it went away for a couple days but then came right back. I've read about arching in the ignition coils or changing the coil pack or even the fuel injectors. Any ideas of where I could start? It idles a little rough but its definitely not terrible.