Hi every one I am having trouble figuring this one out. The problem I am having is weird. The truck runs fine at start up. Then after I drive for a few minutes the truck starts to run ruff and hesitates at acceleration. After driving for a few miles the o2 sensor fouls and is covered in black ash. The code reads as lean and low voltage on bank one sensor one. But the truck smells like fuel, un burnt fuel. I am thinking maybe a bad coil or a fuel injector leaking off. Anybody out there have this problem or know a check list to go down.