I used the line coming from the brake booster, not sure which one you are trying to use. Not at all trying to be rude but make sure you disconnect the side that attaches to the brake booster and not the intake. Other than that I would say just make sure the clamp is far enough down that it is not grasping anything and maybe put a little bit of wd-40 or other lubricant around the edge of the vacuum line and let that sit a while then go at it.