i have an 04 lly duramax. Every once in a while when i get in the throttle hevy at low speed it pops and blows white smoke for a second. like an injector getting stuck open has anyone ever had this problem?

If you feel it is an injector issue have your dealer check your balance rates.
Other possibilities include a bad head gasket, gummed up PCV or a bad PCV diaphram.

Any other thoughts guys?