CHEVY 4DR. 4X4 94000 MILES

2001 Chevrolet Blazer

Abs and brake lights come on occasionally, but no problem braking. Also automatic 4x4 flashes from 2wheel to 4lo then 4x4 service light comes on. Next time car starts no warning lights. Happens at random. Any ideas?
May 25, 2007.

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