Engine stops intermittently, all warning lights come on, clicking under the drivers side dash, restarts okay and all warning lights go out. Once happened at 70kmh engine restarted itself and again runs fine. Oil in the engine and trans changed twice a year with amsoil. This problem started after the battery was replaced, Suspect a ground problem, but warning lights come on, then go out.
With the details that you have provided, it sounds like it may be either a ground, or ignition relay, but I've also encountered the same problem being the starter wire to the starter. The reason I think that is because of your dash lights coming back on .If you have use of a voltmeter you can test and see how much power is actually going to the starter An ignition relay could do the same, but usually won't interrupt the engine after it's running.
SOURCE: sunfire gt 97 2.4L. car won't start, small
sounds like a starter solenoid went bad which it is easier to replace the whole starter assembly then just the solenoid and you can get one with a LLT Limited Life Time warranty.
SOURCE: 1991 Pontiac Transport Engine stall
Problem mayby ECM control unit and couple fuse (EGN)
But your start motor working???
Code 12 meens "No distributor reference pulses to ECM/PCM"
SOURCE: Car stops while driving
The lt1 has many sensors that can go bad. When the optispark goes bad the car does not idle regular. When the car shuts off at a light or with the ac on it can be the idle air control (IAC). When the car shuts off when your foot is on the pedal or regular driving it can be the ignition control module (ICM).
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