I have a 2005 Chevrolet 1500 with turbo 5.3. It runs great except when trying to build boost. No matter what rpm it is running when pressing the throttle far enough to command boost, it sounds like it hits a 2 step and rpm actually starts to fall. This only happens under load. It will free rev to the moon.
No codes. Looking for a place to start troubleshooting. 2005 miss boost.hpl2005 Truck Base 11-10-16.hpl