Quote Originally Posted by ryan roopnarine
wd40 isn't going to make your idle jump the way carburetor cleaner will. try it with that instead.
I thought the reason for RPMs changing when spraying liquid around potential vacuum leaks was because the liquid itself temporarily seals the vacuum leak resulting in a more normal mixture or running condition. I don't understand why the liquid itself would make a difference, it's just the means of sealing the leak temporarily. I could be wrong (and probably am) but that's how I thought it worked.