I had the same problem.. After trying many things I figured out how to fix it.. I Returned the Diablosport to Summit and got a buddy to tune the truck with HPtuners... WAY Better Now.

You got it Mike... This is the back up.. When reloaded throttle works as stock. Keep this file it may help you guys.
Is the back up tune file for a 2016 GMC Sierra 5.3L 8 speed 4x4 SLT.

O and thanks again for all the help.

Here is a data log that shows me in park throttling the rpm and you can see when im in drive gears that it just idles and doesnt see throttle percentages.

I think I attached it.. The driver didnt work anymore on my PC so had to reload the software on my laptop

I have skipped that every time except once when it was apparent it wouldnt do it. I just loaded a tune again and data logged it.. That is what your asking me to do? Correct? Well now I cant get this device to communicate with my computer to get you a file. Looking threw all 8 pages of your ...

Will do.. Give me a quick how to on the post the tune files here part..

Pics for attention for Help with this...

http://i1232.photobucket.com/albums/ff369/NEMESISVETTE/a54a8a44-63ea-4c91-9c58-c243ff934c69.jpg

http://i1232.photobucket.com/albums/ff369/NEMESISVETTE/20160214_122122.jpg

http://i1232.photobucket.com/albums/ff369/NEMESISVETTE/01f59d7d-579d-4377-8a1e ...

Ok Ive spent over a hour doing this to make sure im covering everything.

I restored my stock tune. Throttle works
I hook up tuner fallow its easy commands.
It does ask to read TCM and fails to do so every time.
I have loaded every easy tune and every advanced tune. Not changing anything.. Just ...

O and Thank you for the reply and help..

So I cant load one of the preloaded tunes like the 87 octane tune or the 93 octane tune? Because when I just load that tune and change nothing else it does the same thing. It takes the tune and when I crank the truck up and im in park I can rev the engine (throttle works) but when I put it in any ...

Hey guys just got the Diablo i2 for my 2016 GMC Sierra 5.3L 8speed. When I install any of the preloaded tunes like the 93 octane tune it takes the tune and while in Neutral you can push gas pedal and get throttle but will not take any throttle in Reverse or any of the the Drive gears? I tried over ...

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