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There is a possibility that it could be another component causing problems (IPC, wiring, ignition switch) but in my experience all of the Grand Ams I've had with those symptoms have turned out to be the VATs chip in the Ignition cylinder. They seem to be intermittent too. I've done just the 10 min relearn for a few customers that couldn't afford to have it fixed but then they just come back for the same problem in a few days/weeks.
If you need help reading codes or setting up tumblers let me know.
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