So, i got two codes on my truck, one is a P0131, which is O2 Circuit Low Voltage (Bank 1, Sensor 1). And the second code is what really concerns me. P0300 Random Misfire. I'm very concerned about that one. What can i do to try and solve these? I just installed long tube headers on my truck, and one the o2 sensors i needed to cut them and extend the length of the wires. And i thought, there was only three wires when i cut them, a white one, blue one, and a black one. Well it turns out there's 2 black wires. And i don't know which is what. So, its a possibility that i hooked two wires up incorrectly on the o2 sensors. I had a 50/50 chance, so i thought i would get lucky. Would having the o2 sensor hooked up incorrectly cause the random misfire? Or is that a spark plug/wire issue? Right now, my truck feels really gutless, and is burning a LOT of fuel, so i'm assuming either one, if not both of the front o2 sensors are hooked up wrong.