NEED SOME HELP ON A 2007 5.9 CUMMINS
 

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I NEED SOME HELP HERE GOT A 3500 2WHEEL DR DUALLY 2007 5.9 MANUEL 6 SPD IDLE VERY RUFF AT 14-1500 RPM AND AGAIN AT 2100 TRYING TO FIGURE IF ITS THROW OUT BEARING OR INJECTER PICKUP HAS 118000 ON IT HAS A DT CODE 2100 ?THANKS CHRIS