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So i have an issue with my 6.5. I have already replaced the wastegate actuator, boost solenoid, intake temp sensor, egr (tuna can) and the map sensor on the the intake. The issue I am having i have gotten mixed answers but I wanna hear your opinions. I can be driving down the road just fine and then all of the sudden the RPMs will go sky high but its not picking up speed. this lasts a few seconds then goes back to normal and will do it again. Normally if i turn the truck off and restart it, it stops for awhile. its like the motor surges or the transmission is slipping but it doesn't feel like any slipping transmission i've ever dealt with. could definitley use your input. Also I should add the PMD was re located before i owned the truck.
 

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Do you have another pmd to try and are you using a 6ft extension harness that extends behind the front bumper?
 
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Have you checked for trouble codes? That would help to narrow down the problem.
 
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