Have the engine and trans mounts checked.
The fuse box on a 1986 Buick Regal is located below the dash near the brake pedal. It prevents circuits in the vehicle from being overloaded.
to the left of your brake pedal there should be a little hatch. its behind that
Foot on brake pedal or linkage to trans is loose or out of adjustment.
I just did my Mom's 1991 Buick regal 3.8L. I removed the kick panel underneath the dash above the brake pedal. Follow the brake pedal arm up on the right side of the pedal. I used a mirror to spot the flasher unit. The flasher unit is held by a spring clip with the top of the unit pointing down. Just pull the flasher out of the clip and pull it down.
Probably your emergency brake pedal. Try lifting up on your e brake pedal and see if id goes out.
Most likely it is either the brake light switch, under the dashboard, connected to the brake pedal or the turn signal switch inside the steering column.
As a safety design, you do need to step on the brake pedal to shift out of park. If you are doing this and still can't shift, there may be something wrong in the transmission.
press the gas pedal down 3 times with ignition turned to run position but dont start car thats it
On my 1999 Buick Regal the DRL module is located on the outside foot well behind the parking brake pedal under the carpet. My DRL has gone bad and is making the car quit.
Sounds like the brake switch underneath the dash connected to the brake pedal is stuck. Look under the dash at where the brake pedal is connected and move the pedal with your hand and you should see an electrical connection or contact mounted to the pedal.
Bad motor mount.
The fuse box is under the dash on the drivers side of the car, look near the parking brake pedal. LOOK FOR A SMALL RECTANGLE DOOR THAT IS HINGED AT THE BOTTOM