if you were at a steady cruising speed over 45 (for a min or more in most cases) and came to a stop ther is a posibility that your transmissions TCC (Torque converter clutch) is not releasing properly.
this is actually a faily common problem in (older) GM FWD tranny's that is usually solved by replacing the TCC solenoid (i have done over 30 of them, maybe more, i lose count).
but if it never happens again- Fuhgedaboudit.
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Psychotic Gearhead/Redneck/Mekanik
94 Olds 442 Twin engine's! 6.9L/425 cu inches and 12 cylinders!
13.81 @ over 98 MPH! consistent 1.9s 60'!