CM870 vibration and black smoke

[Mluper7]

Thanks. I do know that the EGP sensor is daisy chained in the harness with the intake pressure, cam positio,n and intake temp. I've gone over all those things which I have had issues with in the past. Every once in a while I'll turn the ignition on and my check engine light will appear and my Road Relay with say Intake Manifold Pressure Sensor Circut Service Soon. I've replaced the sensors and traced Ll the harness looking for faults in the wiring. Sometimes during a high idle after it's been sitting over night it'll miss. Almost as if an air bubble made it to an injector. I was told by one of our Cummins experts that when a actuator starts to go bad that's a sure sign