can someone help with trans problem on 1992 Chrysler LeBaron

on start trans goes up in normal way. when car slows down it goes into a lower gear and then remains there. i must either stop and restart engine or ride in neutral and restart engine to get back into regular gear shifting. happens often. help!!!

Asked by for the 1992 Chrysler LeBaron
Take the car to a transmission shop to a Chrysler specialist.
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