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Originally Posted by gm_classic
A few weeks ago my 93' lesabre wouldn't shift out of 1st unless i played with it. I changed the fuild & filter and everything was fine. That is until the next day when my reverse went out. If i press on the gas hard enough it will jerk back sometimes. trouble codes 31,& 36(neutral safety switch, shift control problem
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Sounds electrical. Maybe bad solenoid? Or connection.
I would also try to do a pressure check.