All this reliance on electronics makes people soft and not capable of critcal thinking and logic. They just want answers and be told what to do. When apocalypse comes, those who can't set traps for rabbit or kill with your bare hands are gonna starve to death! Zombies are gonna getcha even though they're slower than molasses! Come see our newest game in Orlando: http://nomadicvr.com
Now, i'm going to show you some survival skillz. Put down the xbox, or tablet or whatever gizmo is your temple of Truth and get hands-on dirty and touch your car physically and mechanically. Touch it, feel it vibrate, learn how it sounds when it's healthy and when it's sick. Pull and yank on hoses to see if idle note changes. Squirting with propane, carb-cleaner, water or even strategic aiming of pee can help, but you need to have some prior experience to recognize the subtle change in idle tone. And you need to know where to squirt.
Here's a sure-fire 100% way to find vacuum leaks with positive visual confirmation.
1. Plug your exhaust with banana, potatoe, cork, wet-rag or whatever gives 100% blockage
2. Make a plug fitting that replaces MAF on intake hose with compressor quick-fitting
3. Install your plug into intake hose which normally connects to outlet of MAF
4. Then set compressor to 3-5psi and connect to fitting
5. Squirt soapy water at every connection point from intake hose all the way to intake valves. Every seam, every joint, every clamp, etc. Pay particular attention to intake-manifold to head mating surface. Also injector tips.
In this case ironically, I had leak at external idle-valve. There's O-rings and seal inside case of idle-valve that needs replacing.
And another leak at throttle-body/TPS. There's O-rings on both sides of butterfly shaft that needs refreshing.
Also leak by dipstick tube. Looks like someone previously replaced O-ring with one that's too big. New correct O-ring with some sealant takes care of that!
Bubbles stay around leaks and gives you time to find them. Squirting propane isn't nearly as effective because you need to squirt at ALL leaks simultaneously for enough to get into engine to affect idle note. And you can't see propane and see exactly where it was sucked in. Bubbles are easier!!!