I tried to start a new thread with this but it wouldnt let me. So here i am to hijack! Maybe it'll kill 2 birds with 1 stone. Codes say O2 sensor detected lean condition. Car starts n runs fine. Out of nowhere it almost dies and bucks then back to normal. When the CEL comes on the car runs better. You can smell the rich mixture. It drives ok, not perfect but it only bucks at idle. From what i can tell its rich when its driving too but at a higher rpm it doesnt buck.