To my knowledge its just a hose, yes. The valve itself is what the hose came off of on the valve cover. I slid my hose onto my cold air intake when I installed it and didn't push it up far enough, so I believe it was causing a vacuum leak. You really have to make sure the hose is up against both connections really tight. But, I do know that the jumping in rpms is from a vacuum issue.
2009 Mustang GT Premium; FRRP 4.10 Gears, J&M Lower Control Arms, BBK Long Tube Headers, BBK Catted X Pipe, Pypes M80 Mid Mufflers, Pypes Pype Bomb Axle Back, JLT Series 3 Cold Air Intake, Bama 93 Octane Race Tune, Black Decklid Panel, Weathertech Mats, SVE Shifter and Shorty Antenna.