Have replaced EGR. as it was carboned up, also replaced heater plugs as there was only two working. Now when driving the vehicle at steady speed it feels as if the engine keeps cutting out and on accellaration black smokes quite badly. The emmissions would comfortably pass mot. Have changed fuel and air filter. On live data the readings fluctuate on MAF sensor, tryed new earth to air flow meter made no difference.No fault codes in vehicle starts well and performs, fuel comsumption good. Would appreciate any ideas thanks.