transmission wont shift out of 1st all of a sudden on 1990 Geo Prizm

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
work great no slips just all of a sudden from a stop sign
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fyi 70 dollor transmission governor after further diagonis and your answer was not very approite thank you