I just bought the car supposedly needing a trans. has 190,xxx miles. When the car is in park it will move backward like it is in reverse if you give it gas, if I put it in first gear it also goes backward but seems to catch sooner like its a different reverse gear. pretty much every gear goes back except 3rd seems to be neutral. I'm putting it in the garage, gonna swap out the trans computer and check the shift linkage. Any ideas? Has anyone had this problem before. Feedback please, thanks!