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automatic cruise control, unwanted

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2000 6.0L, 5 spd, 4x4, ex-cab, swb.  Notice: 5 speed, manual.  

Get this truck over (about) 1700 rpm's & it'll maintain speed (foot off the gas) till it hits a big enough hill.  It'll gain speed/acceleration down the hills.  It's kinda like the cruise control is on.  

The big problem is when out of gear & rolling, motor will rev way up, eventually bump itself down, then wind-up again.  BIG PROBLEM-  Can't just take it out of gear & coast down, unless you wanna hear that motor wind out.  

Usually a buzz sound, similar to a street light buzzing happens around the same time, not sure if related.  

Already replaced a throttle control.  Have been told wiring problems are common for 2000?  

Any ideas ?  


Edited by 00 6.0 4x5sp
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