2002 Chevrolet 2500HD 8.1L trans shift and runaway throttle

[IDTag]

I tuned my 2002 Silverado 2500 HD with the 87 octane and the shift is extremely soft, like shuddering between shifts soft. It is the Allison trans and shifts fine with the stock tune.

I've also got the weird sudden acceleration syndrome I've read about with the 8.1L. Mine occurs when letting off the throttle. Most of the time it's pretty much a throttle blip but a couple times it's really gone hammer down.

What do you need to adjust the tuning? Thanks.

[mikel]

load the tune to the truck then post the backup and last tune written files here please.

[IDTag]

Not sure how that date works but here are the files. Wasn't sure if it's the unknown or the other backup.

[mikel]

here you go, save this to the i2 drive and let the device import it then load the custom tune to the truck.

Thanks

[IDTag]

Thanks! So far so good. Taking a trip this weekend so glad to have it back under control.