the power valve does stick, because the actuator from the servo is not aligned well with the cable housing......wish i could post pics, but i don't know how...but take a pic with your i-phone from behind the servo looking forward....you will notice the actuator on the servo is not aligned with the cable housing, you can cycle the servo actuator without the engine running....you will notice that as the actuator moves thru its range of motion, it gets canted to one side, and by doing so, binds against the cable housing.....a simple fix is to use a pair of pliers to bend (slightly) the bracket that holds the cable so that it aligns more perfectly with the the actuator .... actuate it a couple of times, and it will work perfectly....mine does not bind at all now