Thanks, XXXXX XXXXX will see the diag chart we are confronted with. the problem could be one of several in the list. We can narrow out some like bad o2 sensor, exhaust leaks, fuel leaks etc but I am now thinking of narrow down to possible early fuel pump failure signs. Fuel is stored in tanks undergraound and is ice cold when you pumpit. the fuel pump runs at very high speed and hot and the gas cools it. When you shut off car at the pump, the fuel pump actually increases in temp, hit it with ice cold gas from the fuel pump, and they can react by not pumping or pumping slow. Most fuel pump failures happen at a gas station. the miss at idle, lean fuel condition and then the stall out, leads to the pump but... a fuel pressure test under different conditions will have to confirm this. O2 sensors normally do not cause a running problem, just light and maybe bad gas mileage. Not a fuel filter as the problem would be constant. I am going to say weak fuel pump. cant be 100% as this is by elimination primarily and not looking at scan data. I hope at least you knwo what the worst case scenario would be.