Stalling problems with chevy 2500hd 6.0L

What is your question?

My 2001 chevy Silverado 2500hd stalls when im in revers with my foot on the break, also when im stopped at stop signs and red lights while holding my foot on the break. The rmps drop and it dies, unless I catch it and throw it into park then the rpms go back to normal. Seems to only happen when I have to hold the break. Has anybody else had this problem? I've tried everything.