Don't disconnect it from your PC. It can take a long time to update and appear hung. It just takes a while to install the update.

What transmission and gearing do you have? Are you only doing an ECM tune or are you also doing a TCM tune? Have you changed any of the default settings for the 87 octane tune? Is AFM (DOD) still on?

I posted this within the Sierra thread but I'm not sure if anyone checks it anymore.

have a 2014 Silverado and I'm experiencing the same things as what is written about. I don't know if the 91 octane tune has the same problem but I'm running the 87 and when you enable throttle boost, it ...

2015 Silverado. Thanks!

Do you by chance know if when you chose a different tune it overwrites the last tune or do you need to flash back to original first?

It will write the new tune. You don't need to flash back to stock first.

I have a 2015 Silverado with the 5.3 and 6 speed tranny. The ...

I have a 2015 Silverado with the 5.3 and 6 speed tranny. I have found these settings seem to work the best for my truck

87 octane PCM tune
DOD turned off
10% throttle boost

Stock TCM tune
Torque management turned off

I also have a Corsa sport cat back exhaust installed

I think torque ...