95 3.8 windstar hesitates

[mdwestrob]

My 95 has 60,000 miles on it. Once it warms up it begins acting funny. If I am driving along at a steady 70-75 mph and let off the gas, It will hesitate and run poorly for about 10 seconds and then clear itself up and drive fine. AS long as the speed and load stays constant things are fine. Also it surges while idleing at times. I just purchased it used and had I done a little research beforehand I would have passed on it.