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Do you know someone with an OBDII scanner? Ask them to scan it.
How many miles does it have? Another question: Have you installed a aftermarket "Power" chip? If those go bad they can really screw with your tranny. Otherwise it sounds like your shift solenoid might be sticking, or on it's way out. Being an computer controlled tranny, I would suggest you bring it in to a shop that specializes in transmission repair/rebuilds.
Good Luck
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93 Suburban 2500
203,000 miles on engine still running like a champ!
Tranny rebuilt at 197,000
My Daughter calls it the bus, and sits in the
third row seat praying for potholes and speedbumps!
Just Horsin' Around Equine Services
http://www.JHA-Trans.com
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