Transmission problem
1998 Buick Riviera 6 cyl Front Wheel Drive Automatic 125000 miles
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My 1998 Buick Riviera has been a great runi car, until yesterday.. When the Car is in PARK, it still goes forward when you step on the gas. Also, It will not go into reverse at all. It in facct goes forward when you put it into reverse. key note: This problem started not too long after the tranny was flushed & ffillled. ( No new filter, No pan was dropped) What are the chances of having clogged valves? Would a professional Flush & Fill wit a new filter & gasket fix my problem?
Thanks,

Riv Owner