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95 LeSabre,127k, lights(interior and exterior) intemitently dimming, engine runs fine/then rough/then fine, transmission occasionally SLAMS into gear from a stop,hesitation or miss at idle and driving,transmission does not engage, check engine light on and then off, all of these things happening off and on with no real conection to each other or external condition(heat,cold,warmed up or not,etc.) Tried to get diagnostic check but code reader says error.OBDII connection.Im simply guessing, but I'm thinking the ECM? Anyone have anything on this kind of problem?