Sounds like the extra electrical draw is affecting your car's performance. Before you go replacing equipment, double check power and ground wires to make sure connections are good and clean, to include fuse holders. You might also need to reroute your power wire away from sensitive electrical sections, like your coil-on-plug wires. What wattage system are you running?Update: So it actually wasn't the sparks, although they were gapped improperly. It was my amp. I had disconnected my amp to fix the power wire, after the terminal got all bent, and today I hooked it back up and my car started driving poorly again. I unhooked my amp again and boom, back to driving normally. So it looks like my amp is affecting my car's performance in some way, shape or form. I think I may need a new amp since the one I have is rather old, or maybe my wiring is off or something. Thanks again for all of your help, especially those who explained to me the importance of changing my transmission fluid. I'm fairly new to this site and you guys have been awesome. Much appreciated.