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My engine rpm goes down while driving wont shut off ....just keep idling few seconds then comes back on ...no check engine light....same while cruising or pedal....any help ???

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If you can't shut off engine and the throttle pedal won't work and your idling at 900 rpm , the vehicle control unit  VECU has lost coms with the engine  ECM on the 1939 data line yellow and green twisted wires

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Give me some other symptoms of while driving it. Is it bucking when you lose rpms? Smoke? Continuous or Spotty? 

Also, it is just a feature on those trucks to not shut off when you turn the key off.It's nothing bad, just something the engineers have given them. 

 

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