I have a Automatic 1991 integra GS and this has been happening for a wile. When I put it into reverse the rpm goes from 1,000 to about 4,000 and then i step on the gas to back up it doesn’t move. The Rpm just revs but the car doesn’t and like after 15 seconds of reving it finally moves. I went to a shop to have my trans fluid changed and it is still doing it I need some help.:shock: