Chevy Silverado 1500 with the L3B engine are included in a Service Update with a fix for a fuel injector flow rate problem.

The Engine Control Module (ECM) is a crucial component in ... it's best to visit a nearby repair shop for assistance.

No parts are needed to complete the repair, which involves reprogramming the Engine Control Module with the latest, up-to-date calibration. The whole process requires about half an hour.