hi just starting to get a problem getting stiff throttle pedal when you first just down throttle just the first 1/4 to 1/2 inch.is this anything to worry about.i am a disabled person with muscular dystrophy and cannot jam on the brakes as hard as a normal person.plus in todays paper there is an article where a lexus crashed and all where killed as the throttle jammed.do i need to worry?. many thanks.