Hi, I have a 95 Olds cutlass with a 3.1. When I start it, it runs rough like a missfire. Feels like it's about to die when I put it in gear. Runs alright until the torque converter locks up and you put a decent load on it, then you can really feel the miss fire. If I unlock the torque converter and Rev to 2500+ it cleans up but still surges. Has new plugs and wires, also it throws a code about the oxyen sensor but it was doing that before the mis fire. Checked the plugs, all look good and non are cracked. This all started when I went to start it up, ran fine the day before.