Just a shot in the dark. Check the torque converter lockup solenoid. Had similar symptoms with my Cutlass Calais. Stall when come to a stop. Etc. I don't quite know what you mean by sputter, but the engine does shake and struggle to live when the transmission stalls it. The solenoid typically disengages when the ignition is turned off and on again but may not if it is badly seized. If you select neutral before stopping it may also get the solenoid to disengage, and if your rolling when you re-engage drive, your drive train may have enough RPM to avoid stalling the engine.
I disconnected it and had no further problems. Course didn't have O/D anymore either.
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Wednesday, October 11th, 2006 AT 10:36 PM