CADILLAC: WHEN ENGINE IS AT OPERATING TEMPERATURE, A ROUGH IDLENESS IS FELT IN SEAT OF VEHICLE AND THE SOFTWARE NEEDS UPDATED CALIBRATIONS FOR REPROGRAMMING ENGINE CONTROL MODULE (ECM) AND FUEL PUMP CONTROL MODULE (FPCM), SEPARATELY. MODEL 2013 ATS. *PE UPDATED 1/16/2014 *JS UPDATED 3/27/15. *PE
