I had the same thing happening with mine. My problem was the throttle blade holding the butterfly valve inside had broke right where the screw holds it on. You might just peek inside and see if anything is broke.
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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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