Hey guys, I really need your help here. I'm trying to sell my SC soon like within the next few weeks and I'm having an issue in a BIG way. I cannot sell my SC with it running like this. It will give a random pop (misfire) at idle, but under any moderate to serious load it misfires like a mother clucker. I had a full tune up last year, caps rotors plugs wires and TODAY I got my fuel filter deleted desperately hoping to fix this issue. I'm so disgustingly frustrated that I drove out of the mechanics and misfired all the way home.

I got an main o2 sensor code and a few weeks after is when this misfiring under load started. Could a main o2 sensor cause this misfiring? Please help me, I'm desperate.

 

It could be anything. But the easiest thing would be to check your spark plugs; make sure they are gapped low enough and not fouled out. It's most like an ignition problem, MAF, Timing, or wiring. Good luck.