Cm870 egr problems

[wdm89]

Hey guys I need some help. I have a cm870 with egr problems. Replaced egr twice and still showing egr fault code. I've replaced all the sensors and still no change. I checked the wires to the egr motor and both are hot 8.75 volts. So I checked from ecm both still hot. Is my ecm bad or do I have something else wrong. Boost seems good but no gauge to tell for sure. When shifting gears it hesitates and blows black smoke then fine. Dont know if sedate is causing that or what. When on cruise going down a hill sometimes the turbo will flutter a bit same don't know if it's cause of derate or something else. Any help would be greatly appreciated. Thanks