1999 Ford F150 4.6L (W engine code) running problem?

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Determined

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Idles smooth until you snap throttle, engine looses power & sometimes dies. If you roll into the throttle somewhat slow, your fine. Plugs replaced w/ O.E plugs. Fuel filter replaced & fuel pressure in specs. No check engine light on. Mass Air flow, oxygen sensors, TPS test good. Air intake delivery is not restricted.
 
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