Corvette pedal issues

[Curtb1971]

Hey guys, I took my truck to the tuners yesterday and we are having issues with some mis-matched components on my frankentruck. I wanted to document the issues and hopefully get some input for future builds.

Swap is a 09 LY6 6.0 (bone stock), howell harness, 08' truck ecm (base file), 04 4l60e, 05-13 DBW corvette pedal

The issue is the vette pedal and truck ecm/throttle body are not jiving. Throttle spuders out after half way. The truck pedal and vette pedal have the same voltage outputs but the sweep is different to the throttle body. The tune shop says that I'll have to take the truck to a dealership and up load a corvette base file on the ecm with a vin# (gm copyright) then they will be able to dial the truck in. I'm scheduled tomorrow at the dealership then back to the tuner Friday. Is there anything we are missing here? Thanks, Curt