I had a similar problem on my acadia gmc 2010. i had to take it to a dealer and they only suggested an oil, change and also cited some other minor glitches. surprisingly nothing major.
Does this have rough idle? not yet? what type of oil do you use? ....45-60mph and they cant or wont? This vehicle is equipt with a camshaft postion actuator, this in return controls cam angle ****** and cam angle advance.. They need to hook a labsope and see what the cam phase is and a flight recorder to see where it is. You need to ask that question to them here is the result burnt exhaust valve that you will buy.
45-60mph almost like TCC commands . can you tell them to reflash the transmission?
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