Actually came across a similar problem in my shop. Ended up being a bad GEM (generic electronics module) which is just a fuse box in console area just right of drivers floor area. Replaced it and it worked fine.
Also there has been a common issue of water leaking into the central junction box (left rear of engine compartment near drivers firewall) causing corrosion on terminals in big block connector. Can be taken apart by ratchet and socket, cleaned with contact cleaner and use dielectric grease on terminals before putting back together.
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Saturday, January 25th, 2014 AT 1:34 PM