can you hear any vacuume noise inside the car when the pedal is depressed ? the rpm shouldn't change when the pedal is depressed unless there is a problem with the diaphram[induced vacuume leak]. not any progress on my humpback lately due to the cold-i just can't take unheated garages any more..............we're supposed to get another blast of snow & sleet today.....stoopid groundhawg........