What would cause my Transmission to when I an going up a slight incline to shift on 2001 Hyundai Elantra

for it to shift down and mand want change back I have to stop and turn Key off and it will click like everything shuts down and then I can start it back and it is fine

by in Tuscumbia, AL on August 12, 2013
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1 answer
ANSWER by , August 13, 2013
seek a free diag and est from aamco then shop prices