at highways speeds when im exiting highway it seems like its speed braking....like it wants to downshift ! rpm fluctuates,,,, i got code p1758....i really hope its just the seleniod ! no flashing d4 light and no check engine light. just put reader on it and showed that code....thanks

 

anything?

 

i tink thats the lock up solenoid, try they connection 1st, might be loose or dirty, if not then ,.. yah , the solenoid.