2000 pontiac montana shifting hard?

jd b

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i have a 2000 pontiac montana and when it gets warm it shifts very hard any suggestions i just paid 500.00 on censors and solenoids please help
 
sensors and soloniods that do what?
1 got fluid?
2 ever replace fluid and filter
3 bad running engine can fool tranny [computer gets confused and doesnt know when/how to shift

find a good mechanic,,,i let my tranny guy do tranny stuff
 
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