I recently bought my 03 LB7 with 103589 miles, On the way home I noticed smoke at idle. I carried it to the dealership where they diagnosed 4 bad injectors. I have spoke with GM and they tell me there is a bulletin that covers injectors on LB7 up to 02,for 200k, but the 03's are not included.
Has anyone had dealings that I could use in my mission to correct this?
Thanks in Advance

They deal with 03's on a case by case basis. You should be able to get them under warranty but it might require some phone calls and ladder climbing.