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If you lay something heavy on the gas pedal it will stay open. Once open, you can clean the back side with a rag attached to the end of a rod.
Regarding this comment.....I did this cleaning operation last week and had the wife step on the throttle while i cleaned the butterfly valve...she said she had her foot to the floor but the valve only opened maybe 25%? is there an eletronic assist that helps set the position? i am also fighting the low mileage in my 100 so i am wondering if there is something wrong here
thanks all barrypt5