why is it shaking and hesitating when accelerating. on 2000 Ford Expedition

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It shakes everytime you push on the gas, and quits when you don't. sometimes it will shake when sitting there. Idols higher than normal. running pretty rough now.
(2) Answers
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Sounds like you have a misfire problem. Here is an article about misfires to help explain what it is :
Go on Ebay and get an aftermarket set. I bought 8 coils for $57.00 (free shipping); bought my plugs locally and found a mechanic to install them for $45.00. My Exp. did the same wasn't burning all the fuel. Get them all replaced at the same time or it will throw the computor off.