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The car runs smooth untill I reach 1500rpm the car starts buck but past 1600rpm and up it smooth

(1999 Ford Taurus)
in Issaquah, WA on February 28, 2016
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on February 28, 2016
Vulcan OHV V/6 ... Duratec DOHC V/6... OR.. SHO V/8 ??? .. IT makes a difference as there are different ignition systems and different possibilities!
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on February 28, 2016
check ALL vacuum hoses for dry rot,cracks,splits,collapsed.check at the PCV valve for collapsed or cracked hose first.
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