Okay I know this has been discussed at Great length with no resolution other than live with it. What I have gleaned is the ECU senses a load greater than what the alternator can generate at idle (maybe?). Not sure how my theory plans plays out yet, but I'm pursuing this. I've got an idea, just take control of the alternator away from the PCM. Put an internal regulator in the alternator, then tune out the alternator in the PCM, I do have HP tuners. Any thoughts? another thought I had was to interrupt the alternator turn on wire, which is C1 wire 2 at the PCM, or B wire at the alternator. Need to find out if it's positive on or no voltage on. I'll let you know what happens. I just don't believe there's not a fix, we didn't have problems like this before they let the ECU control the alternator, that's my theory that I'm starting with.