Just got finished with turboing my 2006 Silverado 2500HD , got a base tune from my tuner and truck starts up great . The issue is if you give the truck any throttle at all over 2000 rpm " Reduced Engine Power " pops up on dash . Truck is in Speed Density so only DTCs are P0102 & P0103 . With the key in ON position and truck NOT running, if you give it any throttle over 20% it will pop up also. After hours of research I see that this is a very common problem , I have checked all grounds and tried swapping my TB for another used (Supposedly known good ) TB with no success. I've read the pigtail going to the TB goes bad over time or pins may come loose , I did pull test on wires and connection seems good. The battery light is ON when the truck is running also , Installed a new battery no success , unplugged the alternator pigtail while truck is running to see if it volts drop on dash and it does, so the alternator is charging . Any ideas ? Could it be something in tune we're missing ?