Vacuum Hose Leak?

I think I might have a vacuum hose leak. Many times when I press the clutch in, or take the car out of gear, the RPMs drop down to about 400 and the car feels like it's going to die. I hear a hissing noise, when driving down the road. I thought it was an exhaust leak, but I felt and listened for leaks and I have none. My MAF sensor has been freshly and safely cleaned and my CAI filter is 2 days old.

If it is a hose leak, whats the easiest and quickest way to find it? A friend of mine who used to work in a shop said spray the hoses with WD40 and look for bubbles, but that seems like it would take a lot of WD40 and a lot of time with the 20 different hoses in the bay......

All input is appreciated.

carb cleaner works best for find vacuum leaks.

sounds like a leak from your intake, before the maf, if that helps at all. that happened to me, as i instaled my aem cai, and had a small leak. i found it and problem solved.

Or you can just ask a real man to fix it for you.

Or you can just ask a real man to fix it for you.

Didn't see that one coming :grinno:

^^^lol. he got ya.

Or you can just ask a real man to fix it for you.

Rofl yes! I was hoping you would say that, lol.

carb cleaner works best for find vacuum leaks.
Same way you use wd40?

no carb cleaner is flammable, so the idle would pick when you would over the leak (sort of like you just added a shot of gas). not sure about the diag about the leak before the maf, it would still be metered air. if that was the case you should only hear a noise, not much of a performance issue.

thats what i ment, sorry. after the maf. im still getting used to teh new laptop.