accelerating on its own and doesnt idle right all the time
 

I have a 93 gmc sierra 3500 witha 6.5 and at an idle it sounds like it has a huge cam in it but doesnt do it all the time and when i take off from a stop sign it accelerates on its own any ideas??

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When you take off it will be fine then it all of a sudden it takes off on its own

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