Idle issues with a stockish truck

I tuned a 2004 Chevy Silverado 2500HD 4x4 6.o liter Long tube headers, no cats, no rear O2s. It wants to die at idle sometimes, he says. Anyone having anything close to this? And on another note, how do I paste my tune here for you to see?
I think I did it?

And please let me know if there is anything I can do to improve this tune. This is my first shot at it.