- How many miles on the car?
- How often was the transmission oil & filter changed since 1997.
- Are you the original owner of the vehicle?
Your cars transmission is electronic and not controled by hydraulic pressure. There are many electronic solenoids inside the transmissions on todays car. So guessing what the problem is is kind of hard these days. It might just need a new solenoid.
You could have the trans oil & filter changed and drive the car for a few weeks and see if it acts the same way. This is your least expensive option right now.
Ask your coworkers, drinking buddy's, or neighbors of a reputable shop they may know of & trust.
Good Luck
========= Harryface =========
1991 Pontiac Bonneville LE 3800 V6 ( C ), Black/Slate Grey _~_~_~297,024 miles_~_~_
~_~_~_~_U.S.A._~_~_~_~_~_
~~~The Former Fleet ~~~
89 Cavalier Z 24 convertible
78 Holiday 88 coupe
68 LeSabre convertible
73 Impala sedan