I keep getting 2 codes on my truck for PFFFF, i have no idea what these are. I was told to take the engine tune off and bring it back to stock settings to see what these codes meant. But they are still coming up PFFFF. The only problem with the truck is that it has a rough idle sometimes. Thanks

 

What year/engine? If you're using the built in code reader for your tuner, find something else. Tuners don't read Ford factory codes very well sometimes.