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P0251 Error code

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Discussion Starter · #1 ·
I have a 2005 Dodge Ram 3500 5.9 Diesel. It will only start on ether. It idles good up to 1300 rpm. After that it accelerates to 3000 rpm and flucuates back and forth from 2-3000 and will not deccelerate. It has lots of black smoke. I have changed the actuator. No differene.
I am getting a P0251 error code. Any suggestions?
 
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rogo22
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