It sounds like the chip weas burned for an entirely different calibration than you have, they do not always swap from vehicle to vehicle.
make sure to remove the keys from the ignition and remove the chip.
it would need to be reflashed for your truck, but the delta chips are old, and there are few dealers who still flash them.
Mike Litsch
Powerteq Customer Service Manager
Diablo Tech support by phone:
561-908-0040x4
M-F 8:00 AM to 5:00 PM EST