Check the automatic transmission fluid level on a flat surface after the engine is warmed up. If it is low it can cause this concern. If the hill is too steep and the fluid is low it can cause air to get sucked into the transmission oil pump( the transmission uses fluid to operate) causing various issues.
Is there any check engine or service engine soon warning lights on?
If the fluid level is good and there is no check engine light then I would suspect the transmission itself.
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Saturday, March 1st, 2014 AT 4:03 PM