This problem has all the hallmarks of a defective EGR.
Cleaning out the EGR is not likely to cure the fault, the fault on the EGR is a defective sensor, a potentiometer which is read by the ECU to determine the position of the EGR valve as position: fully open, fully closed or a "in-between". The faulty potentiometer creates an erratic or erroneous signal which "confuses the ECU" and leads to the hesitancy or jerkiness of throttle or engine response.