You may have a dirty throttle plate assembly affecting airflow. Remove the intake tube hose from the air filter box to the throttle and have a look at the throttle plate and bore. If it is brown/black in color it needs to be cleaned. Usually makes a world of difference when cleaned. You can use carb spray and a toothbrush to effectevly clean it
Could be a dirty EGR valve I had a similar problem with my car and that what it was
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