Could be the ingition module going bad. Be careful, my car actually shut off on me at 60 miles per hour
Happened to mine.
See if it can be rekeyed to you're current key.
Cost me $555
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Me
2000 Alero running 14's
2005 Nissan Altima (her's)
1967 Olds 330 motor sitting on a stand
1985 Delta 88 w/1968 350 rocket ( MURDERED )