Shutting the car off and restarting it sounds like there may be a computer problem, either with the main ECM or the ABS computer.
I strongly suggest having it hooked up to an analyzer to diagnose or at least eliminate most possibilities there.
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OR trade it on a good lo Chevy grin

There is enough good in the worst of us and enough bad in the best of us that it does not behoove any of us to criticize the rest of us.
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Be yourself. If you are ever lost, It will be much easier to find yourself if you know who you are!