Make sure the spark plugs your using are Motocraft or Autolite double platinums. The duratec doesn't like other kinds of spark plugs, and causes this problem.
My Cars
1999 Silver Frost SVT - 80,000km #2603/2760 Aug. 10, 1999.
1996 Mercury Mystique LS V6 MTX - retired @ 323,151km.
1995 Ford Contour V6 MTX-sold @ 214,000km
