After waiting on traffic light press down on gas and van moves slowly on 2003 Ford E-250

My work van works fine but after a traffic light sometimes when I press on the gas it moves slowly and then it picks up speed. In addition sometimes when I am on a traffic light the car seem to jump foward (like a kick). I changed the fuel filter but no help.

Asked by for the 2003 Ford E-250
scan test it for codes
1 more answer
Could be a number of issues related to the computer engine controls-a computer scan is needed to look for faults in the system or a sensor like the MAF out of range