Automatic Transmission Floor Shift Problems of Chevrolet Colorado

I live in a rural area with moderate hills and many winding roads and tree obscured corners. While driving at a moderate speed (30-40 mph), I experience problems with the vehicle's ability to downshift from overdrive to address the increasing incline. The vehicle will, despite normal increase in fuel pedal pressure, lose rpm's from approximately 2,000 to 1,000. As it approaches 1,000 rpm, the vehicle begins to "stutter" and "lurch" as the engine tries to cope with the higher gear. There are two "fixes" for this; pushing the gas pedal down firmly, which causes the vehicle to radically down shift and "leap" forward, or to drop the transmission lever to "manual" and manually change gears (without the "leap" seen in the first method). The end result of the non-manual approach is to cause the vehicle to accelerate radically in an environment of obscured corners and uphill driving. I believe this is a dangerous safety problem as the area is swarming with deer, bicyclists, pedestrians, etc. I have also had "stuttering" incidents when accelerating from low speed, to enter traffic, interstate, etc. , although these have been intermittent in nature. I have noticed that the vehicle will also radically downshift going downhill without warning and seems to take a long time to up shift once it is on level ground - again an intermittent action. Fortunately no one has been "tailgating" me when this occurs (a common failing of drivers in this area). I have had the vehicle to the dealer twice for the failure to downshift for a hill and they tell me Chevrolet does not recognize a problem with the transmission, shifting, etc. A side note: this problem does not exist in cruise control, but use of cruise control on these back roads would not be advisable.

See all problems of the 2016 Chevrolet Colorado 🔎.