Wanting to die when stopping or turning.
 

Hello,
Im really having a problem I could use some HELP with, my LBZ Duramax has about 75000 miles and feels like its wanting to die as I slow down to stop and when slowing to make a turn.. After stopping it seems to idle fine, it's between 5-10 mpg when slowing down and when traveling slow about 10 mph it feels like its wanting to die out. But it if speed up it straightens out and seems to run fine. It only seems to do it or gets worse after the engine warms up..
Any help and or suggestions would be appreciated.

No one has any ideas or suggestions? I don't feel so dumb now...