ok i am not really sure how to describe this by typing it so here it goes.... when im coming to a stop sometimes my car's idle will jump up to like 1500 rpm's. it acts like its not down shifting right (its an auto tranny). then other times it will be fine. i dont know what the hell it is, is it the transmision or maybe the ecu? what? im really not sure. it feels like im giving it gas while holding in the brake (when im obviously not). so any idea's would be greatly apreciated!