1985 force 85hp trim question

chvy91bowtie

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Joined
May 12, 2010
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1
the power trim on my 85 hp force goes up when i throttle too much in reverse and goes down under power in foward. also i cant trim it up when im under power to get max mph, rpm. ive already checked the fluid it is full. the trim operates up and down great when the motor isnt running. the motor will stay trimmed up for days and wont drop at all. what could my problem be? any help is appreciated.
 
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