I've got a hissing noise coming from around the intake manifold, my idle is erratic, so I believe I have a vacuum leak. What is the best way to find where the leak is coming from?

I've felt around the manifold and cant feel any air leaks, but we can still hear the noise. Any body know a better way to find the leak?

 

Get some carb cleaner. Put one of those WD-40 tubes on it, and spray around any possible locations it could be. When the idle jumps, that's where the leak is.

 

I'll try that.