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99 Ford Windstar kicks (jerks) at around 30-40 Mi/hr

We have a 99 Ford Windstar. My wife, who drives this vehicle most of the times, says that in the last week at least on three separate occasions while doing around 20-40 Mi/hr suddenly the car kind of kicked (jerked) which lasted for 5-10 seconds and then there was some kind of ?friction noise form two things rubbing against each other?. There were no engine lights on.

I filled up the car with super gas and added STP fuel injector cleaner and changed the air filter and took the car for test drive. I could not re-produce the kick, however I was able to produce a noise starting from a dead stop and then accelerating, at around 20 Mi/hr (just under 2000 rpm) I hear this kind of ?howling? noise (?wooow?) and at least once the care seemed a little bit under powered when making this noise. Gear shifts are absolutely smooth and with no jerks. Here is some additional info on the car:

Mileage 119,000. Transmission was changed under warranty at 17,000 Mi. Serpentine Belt was changed at 26000 Mi and no cracks are visible on it. The spark plugs, wires and gas filter were last changed at 97000 Mi. The Transmission was flushed at 98000 Mi and front and back breaks were also replaced at 98000. I am wondering if the gas pump could be on its way out. In any case any advise will be greatly appreciated it.




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