engine on 1998 Ford Expedition

every once and a while while sitting at a red light my vehicle starts to shake and almost dies out and when i start to take off it does not want go it like sputters and then all of a sudden it takes off i have 125,000 miles and the spark plugs were changed at 100,00 miles

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2 answers
my 4.6L expedition motor run rough?
Do you have any Service Engine Soon Lights on? How many miles are on your Ford? When were the spark plugs last replaced and teh coils checked? How is your gas mileage?