Read this on another forum

I was told by my dealer I needed to get a tune in order to remove a couple of drivability issues I did not care for, although they are inherent on the 5.0L. When I went back last week I talked more about the tune and the dealer said they stopped installing tunes from the dealership due to the TSB. They were using FRPP tune and I was told the issue was that the tune was leaning the car out at idle, which in turn leaned it out across the RPM range. This made the car sound better at idle and offered better performance across the whole RPM range. The lean condition was what is believed to be causing the issue. Again this according to a trusted dealer. I dont know how the other tuners are mapping their tunes.

 

This doesn't sound right, and if you trust a dealership, I have some nice land to sell you.