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Carbon Flash said:
Accelerator is sticky in that when you are going around 60 you really got to step on it to get to 65. And can be hard to hold at 65. I was told by the dealer this is supposed to be like this as the computer is saving fuel and you have to step on it ask for power. He said it was a common complaint when the Acadia first came out.
You said you had issues at 60 mph, and while a TSB exists for issues occurring at lower speeds, I'm curious if your '08 had the re-calibration of the transmission performed yet. The re-calibration is described as follows:

#08-07-30-022: Hesitation or Flat Spot Between 56-80 km/h (35-50 mph) (Reprogram Transmission Control Module) - (May 8, 2008)

Subject: Hesitation or Flat Spot Between 56-80 km/h (35-50 mph) (Reprogram Transmission Control Module)
Models: 2008 Buick Enclave
2007-2008 GMC Acadia
2007-2008 Saturn OUTLOOK
with FWD or AWD
Some customers may comment on a flat spot or hesitation between 56-80 km/h (35-50 mph) speed range.

The existing transmission calibration is programmed to maximize fuel economy and requires a greater throttle input than some customers would prefer to provide acceleration in this speed range.

A new calibration is available. This new calibration increases the speed required to obtain upshifts and removes TCC apply from 2nd to 3rd gear, thereby reducing engine lugging and improving vehicle response to accelerator input.

Important: This calibration will have a negative impact on fuel economy of 0-1.2 L/100 km (0-2 mpg) combined driving.

To obtain this calibration, contact Techline (TCSC) at 1-800-828-6860 (English) or 1-800-503-3222 (French). Techline will reconfigure the vehicle to make this calibration the default calibration for this vehicle.

The table below shows the Shift Pattern Change at Light Throttle.

Current Calibration New Calibration
1-2 8 13 12 19
2-3 18 29 20 33
3-4 24 40 31 50
4-5 32 53 43 69
5-6 44 71 56 90

TCC Applied 2nd, 3rd, 4th, 5th, 6th 4th, 5th, 6th

Warranty Information
For vehicles repaired under warranty, use:

Labor Operation Description Labor Time
K5364 Transmission Control Module Reprogram with SPS Use Published Labor Operation Time

Thanks GeoHawk! See original thread -
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