[simulatedwood]

I guess my point was that, you have something in the system saying it is running lean, but it is not running lean, then you have an feedback issue to sort out. If you know the injectors are fine, and your running consistent fuel pressure numbers (has this been verified?), then I don't see how this isn't a sensor issue of some sort.

When the car I was troubleshooting had ground issues the sensor readings were all over the map (o2, MAP, and TPS), this caused a ton of CEL's, but the car ran, OK. At time the idle would die, sometimes surge, sometimes engine ran lean, etc. Spent money on a MAP and o2 sensor that didn't need to replacement, but all the signs said they were failing. As it turns out, just needed to replace the ground wires going to and from the chassis to the engine and all was right with the world, sensor readings made sense and the car ran awesome.