What is it on 2003 Pontiac Bonneville

I have a 2003 Pontiac bonneville that started out shifting into 2&3 gear hard and over reving so I got some Lucus trans fluid that stoped slips and the next day I pulled up to a stop sighn and when I pushed the gas to go car wouldn't move in any gear. So I shut the car off and re started it and put it in drive and it worked fine but it keeps doing it now what do you think it is?

by in Moreno Valley, CA on August 22, 2014
1 answer 2 comments
ANSWER by on August 22, 2014
Trans is shot.
COMMENT by on August 23, 2014
But why would it move and work good after I shut the car down then it would do it again
COMMENT by on August 24, 2014
Internal leaks that get worse as it warms up and expansion occurs. When is the last time the pans been off and filter serviced?
Related Items:
As soon as I turned on my heat, it worked, but then I heard several gun like shot sounds. After my car was parked for several days, I saw what seemed to be antifreeze leaking from my car. I put i...
was able to jump start it. radio and interior lights work when key is turned to auxilary.
It sounds like the starter needs replaced but we just had it replaced a week ago. I was driving the other day and when it shifted gears it clunked real hard in every gear. I brought it home and an...