I had this problem to, and as stated above, it was a problem with the mixture being lean. A flow test on my injectors found that one was not up to par. I replaced it with a good injector and have not had a problem since.
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2006 Mustang GT
1990 LX
GT-40 motor 262 horsepower, 307ft-lbs (sold but forever loved)
1998 Contour SVT
Rice Haters Club Member #244
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