Question about GMC Sierra 2500HD

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Hi folks, my problem is this: When I drive between 115-125 km/hr (approx. 65-75mph), my speedometer jumps around like crazy. The cruise control quits, the transmission unlocks the torque converter, and check engine, abs, and parking brake lights come on. If I get up past 125 km/hr, the speedo quits jumping and reads right. Slowing down from, say, 140 km/hr (80mph) it jumps around again through that same speed. I have replaced the speed sensor in the transfer case and it's changed nothing. Any clues?

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Throttle cable

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How do i set the cruise control on my 1994 mercedes c220 elegance automatic


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-see photo

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set-cruise-control-1994-mercedes-c220-sufrpujyrsap3pvz3w2boz5j-3-0.jpg
http://www.benzworld.org/forums/attachments/w202-c36-c43/153145d1197313761-pdf-owners-manual-w202-1995-2000-1999-c280_owners_manual.pdf

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