Hey guys and gals, I started a discussion a while back about my 98 Dakota having bucking, sputtering, backfiring, stalling problems. OBD scanners say I have a faulty O2 sensor (upstream). I don't believe the O2 sensor itself is the problem. The truck seems to be running lean, has low power when climbing, and is suffering a major efficiency drop. I've read that so many things can cause the trouble I'm having till I just don't know where to start. I recently replaced the ignition coil which inadvertently seems to be adding to my problems. Any advice will help, and if you've already responded to my other post, I apologise but this my only vehicle and I need to get it running.