1992 Oldsmobile Cutlass Ciera 142,000 miles runs great but one problem the transmission will drop out of drive when slowing down below 5 miles an hour or stopping. Doesn't do it all the time about 50% of the time. I can put it into neutral and back into drive and it's fine, no problem any other time while driving. Changed fluids and filter. Does anyone have any ideas what could cause this?

SOURCE: Transmission problem on 95 cutlass ciera

Overdrive has two important factors involving when and if it turns on besides being in the proper gear shift position. One is tthe car has to FIRST reach operating temps before it will engage the TCC ( torque converter clutch ). That could involve a faulty thermostat, or short distance drives, Second important factor WILL DISENGAGE WHEN STEPPING ON THE BRAKE PEDAL. A brake switch could be misadjusted , and without you stepping on the brake, the computer thinks you are and wont engage TCC. Hope this helps.

SOURCE: 1988 3.8 olds cutlass Ciera stalls, no spark until it cools down

Check the prrimary and secondary resistance on your coil. Also check the resistance of the plug wires and plug gap.

SOURCE: 89 olds cutlass ciera bogging down when accelerating.

my 89 cutlass did the same thing....She would bog down ( when the service engine light came on)....Light would go off and she would run fine...Shop replaced fuel fiter and KNOCK SENSOR, runs great now, the service engine light stays off too. Ran a can of MG injector cleaner thru too.