I have a little different problem. 2003 LB7, all injectors done at 175.000 Kms, it now has 241.000, getting smoke at idle and surge at idle. Took it to GM, they put it on the scanner, injector readings as follows;
Injector 1. 0.50 ms
Injector 2. 0.12 ms
# 3. 0.34 ms...