Pretty common problem with these. Here's a guide to learn how to fix GM instrument clusters yourself, I used it to fix mine and it worked great.How to guide for Sierra instrument cluster repair
Sounds like a bad cluster.Had a 04 that would stick at 80.If you turned the key to the on position it would drop 3MPH every time.Had 4 others in the fleet all same problem ranging from 03-06 Chevy and GMC thought they has a service bulitin on the instrument cluster but they would only pay to have it fixed if it had under 75,000 miles I think.Well good luck and hope this helps.
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