PE = Power Enrichment. It's what the PCM locks into for the commanded AFR when you pass a certain throttle percentage.
What Blue is really trying to say here though, is if the fuel trims are way off, then your PE will be off. Being that this all goes off of your LTFT and STFT average, if the car is running rich to begin with, then your Power Enrichment will be rich, and the same goes to if it's lean.
Either way, out of both, you obviously want it to be rich, but it won't be as bad as most people think pulley wise.
