accelarating from a stopped position or in motion the vehicle hesitates sometime on 2002 Ford Expedition

not often, fuel pump has been changed,

Asked by for the 2002 Ford Expedition
Do you have a check engine light on? If so, get code read and post code on here so we can better assist you. Hesitation could be from poor ignition, fuel air mix or exhaust blockage need more info. please.