i have a 2003 ford ranger edge 3.0 5 speed. and it feels like it dont have no power?

it has good power out of the hole but it seems like when you hit forth it falls on its face and when your driving down the hiway in fifth and you can floor it and it takes for ever to hit 70 if your running sixty the truck only has 72,000 miles and is under warrenty but they said they could not find nothing
it has never threw the cheak engine light or anything but i have replaced the mass air flow sensor and tps and plugs but still not much difference. but on some days it runs fine as hell. please help
 
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