2006 cobalt speeds up going downhill

mycobaltmycobalt Member Posts: 1
The car is slow to shift and the rpm's spike up super high and it sounds like it's working very hard. Then it suddenly shifts into the right gear and all is well. Going downhill has become a bit scary, the car speeds up and doesn't stop, feels like it's not doing anything at all but letting gravity just pull it down the hill??
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